Republic Of Korea 424B2 Prospectus for primary offering

Filed Pursuant to Rule 424(b)(2)
Registration No. 333-231096

PROSPECTUS SUPPLEMENT

(To Prospectus dated May 15, 2019)

The Republic of Korea

US$500,000,000 2.000% Notes due 2024

US$1,000,000,000 2.500% Notes due 2029

The Republic expects to issue one or more series of each of the above-listed senior notes in aggregate principal amounts to be determined.

The US$500,000,000 aggregate principal amount of 2.000% Notes due 2024 (the “2024 Notes”) will mature on June 19, 2024 and the US$1,000,000,000 aggregate principal amount of 2.500% Notes due 2029 (the “2029 Notes”, and together with the 2024 Notes, the “Notes”) will mature on June 19, 2029. The 2024 Notes will bear interest at the rate of 2.000% per year, and the 2029 Notes will bear interest at the rate of 2.500% per year. Interest on the Notes is payable on June 19 and December 19 of each year, beginning on December 19, 2019. The Republic will not have any right to redeem the Notes prior to maturity. Except as described in the accompanying prospectus under “Description of the Debt Securities—Global Securities”, the Notes will be represented by one or more global notes registered in the name of a nominee of The Depository Trust Company, as depositary.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these Notes or determined if this prospectus supplement or the accompanying prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

	2024 Notes					2029 Notes
	Per Note			Total		Per Note			Total
Public offering price		99.166	%	US$	495,830,000		98.456	%	US$	984,560,000
Underwriting discounts		0.150	%	US$	750,000		0.150	%	US$	1,500,000
Proceeds to the Republic (before expenses)(1)		99.016	%	US$	495,080,000		98.306	%	US$	983,060,000

(1) The underwriters have agreed to pay certain expenses of the Republic in connection with this offering. For more information, see “Underwriting” in this prospectus supplement.

In addition to the public offering price to the public, you will have to pay for interest accrued on the Notes from June 19, 2019, if any.

The Notes will be designated “enhanced collective action debt securities” (as defined in “Description of the Debt Securities—Events of Default—Enhanced Collective Action Debt Securities” and “Description of the Debt Securities—Modifications and Amendments; Debt Securityholders’ Meetings—Enhanced Collective Action Debt Securities”in the accompanying prospectus).See “Summary”and “Description of the Notes—General.”

Approvalsin-principle have been received from the Singapore Exchange Securities Trading Limited (the “Singapore Stock Exchange”) for the listing and quotation of the Notes on the Singapore Stock Exchange. The Singapore Stock Exchange assumes no responsibility for the correctness of any of the statements made, opinions expressed or reports contained in this prospectus supplement and the accompanying prospectus. Approvalin-principle from, admission to the Official List of, and listing and quotation of the Notes on, the Singapore Stock Exchange are not to be taken as an indication of the merits of the Republic or the Notes. Currently, there is no public market for the Notes.

The underwriters expect to deliver the Notes to investors through the book-entry facilities of The Depository Trust Company on or about June 19, 2019.

Joint Bookrunners

Citigroup Credit Agricole CIB HSBC J.P. Morgan

The date of this prospectus supplement is June 12, 2019.

You should rely only on the information contained in this prospectus supplement and the accompanying prospectus. The Republic has not authorized anyone to provide you with different information. The Republic is not making an offer of the Notes in any jurisdiction where the offer is not permitted. You should not assume that the information contained in this prospectus supplement or the accompanying prospectus is accurate as of any date other than the date on the front of each document.

TABLE OF CONTENTS

Prospectus Supplement

	Page
SUMMARY OF THE OFFERING		S-3
USE OF PROCEEDS		S-7
RECENT DEVELOPMENTS		S-10
DESCRIPTION OF THE NOTES		S-16
CLEARANCE AND SETTLEMENT		S-21
TAXATION		S-24
UNDERWRITING		S-25
LEGAL MATTERS		S-30
GENERAL INFORMATION		S-31

Prospectus

	Page
CERTAIN DEFINED TERMS AND CONVENTIONS		1
USE OF PROCEEDS		2
THE REPUBLIC OF KOREA		3
Land and History		3
Government and Politics		5
The Economy		8
Principal Sectors of the Economy		15
The Financial System		22
Monetary Policy		27
Balance of Payments and Foreign Trade		30
Government Finance		39
Debt		42
Tables and Supplementary Information		44
DESCRIPTION OF THE DEBT SECURITIES		48
General Terms of the Debt Securities		48
Payments of Principal, Premium and Interest		49
Repayment of Funds; Prescription		49
Global Securities		50
Additional Amounts		51
Status of Debt Securities		52
Negative Pledge Covenant		52
Events of Default		53
Modifications and Amendments; Debt Securityholders’ Meetings		55
Fiscal Agent		61
Further Issues of Debt Securities		61
Governing Law, Jurisdiction, Consent to Service and Enforceability		61
LIMITATIONS ON ISSUANCE OF BEARER DEBT SECURITIES		63
TAXATION		64

	Page
Korean Taxation		64
United States Tax Considerations		65
PLAN OF DISTRIBUTION		74
LEGAL MATTERS		76
AUTHORIZED REPRESENTATIVES IN THE UNITED STATES		76
OFFICIAL STATEMENTS AND DOCUMENTS		76
FORWARD-LOOKING STATEMENTS		76
FURTHER INFORMATION		77

CERTAIN DEFINED TERMS

Unless the context otherwise requires, all references to “Korea” or the “Republic” contained in this prospectus supplement are to The Republic of Korea. All references to the “Government” are to the government of Korea.

Unless otherwise indicated, all references to the “2024 Notes” contained in this prospectus supplement are to the US$500,000,000 aggregate principal amount of 2.000% notes due 2024 and all references to the “2029 Notes” contained in this prospectus supplement are to the US$1,000,000,000 aggregate principal amount of 2.500% Notes due 2029. The 2024 Notes and the 2029 Notes will be collectively referred to as the “Notes”.

Unless otherwise indicated, all references to “won”, “Won” or “W” contained in this prospectus supplement are to the currency of Korea and references to “U.S. dollars”, “Dollars”, “dollars”, “$” or “US$” are to the currency of the United States of America.

All references to the “Singapore Stock Exchange” contained in this prospectus supplement are to the Singapore Exchange Securities Trading Limited.

ADDITIONAL INFORMATION

The information in this prospectus supplement is in addition to the information contained in the Republic’s prospectus dated May 15, 2019. The accompanying prospectus contains information regarding the Republic, as well as a description of some terms of the Notes. You can find further information regarding the Republic and the Notes in registration statement no. 333-231096, as amended (the “registration statement”), relating to the debt securities of the Republic, which is on file with the Securities and Exchange Commission.

THE GOVERNMENT IS RESPONSIBLE FOR THE ACCURACY OF THE INFORMATION IN THIS DOCUMENT

The Government is responsible for the accuracy of the information in this prospectus supplement and the accompanying prospectus and confirms that, to the best of the Government’s knowledge, the information contained in this prospectus supplement and the accompanying prospectus is in accordance with facts and that the Government has included all facts that should be included not to mislead potential investors. The delivery of this prospectus supplement and the accompanying prospectus at any time does not imply that any information contained in this prospectus supplement and the accompanying prospectus is correct at any time subsequent to the date of this prospectus supplement.

The Singapore Stock Exchange assumes no responsibility for the correctness of any of the statements made, opinions expressed or reports contained in this prospectus supplement and the accompanying prospectus. Approvalin-principle from, admission to the Official List of, and listing and quotation of the Notes on, the Singapore Stock Exchange are not to be taken as an indication of the merits of the Republic or the Notes.

NOTIFICATION UNDER SECTION 309B(1)(C) OF THE SECURITIES AND FUTURES ACT, CHAPTER 289 OF SINGAPORE (THE “SFA”)

The Republic has determined, and hereby notifies all relevant persons (as defined in Section 309A(1) of the SFA), that the Notes are prescribed capital markets products (as defined in the Securities and Futures (Capital Markets Products) Regulations 2018 of Singapore) and Excluded Investment Products (as defined in MAS Notice SFA04-N12: Notice on the Sale of Investment Products and MAS NoticeFAA-N16: Notice on Recommendations on Investment Products).

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NOT AN OFFER IF PROHIBITED BY LAW

The distribution of this prospectus supplement and the accompanying prospectus, and the offer of the Notes, may be legally restricted in some countries. If you wish to distribute this prospectus supplement or the accompanying prospectus, you should observe any restrictions. This prospectus supplement and the accompanying prospectus should not be considered an offer, and it is prohibited to use them to make an offer, in any state or country which prohibits the offering. For a description of some restrictions on the offering and sale of the Notes and the distribution of this prospectus supplement and the accompanying prospectus, see “Underwriting—Non-U.S. Selling Restrictions” beginning on pageS-26 of this prospectus supplement.

The Notes may not be offered or sold in Korea, directly or indirectly, or to any resident of Korea, except as permitted by Korean law. For more information, see “Underwriting—Non-U.S. Selling Restrictions—Korea” on pageS-26 of this prospectus supplement.

CERTAIN PERSONS PARTICIPATING IN THE OFFERING MAY ENGAGE IN TRANSACTIONS THAT STABILIZE, MAINTAIN OR OTHERWISE AFFECT THE PRICE OF THE NOTES, INCLUDING OVER-ALLOTMENT, STABILIZING AND SHORT-COVERING TRANSACTIONS IN SUCH NOTES, AND THE IMPOSITION OF A PENALTY BID, IN CONNECTION WITH THE OFFERING. FOR A DESCRIPTION OF THESE ACTIVITIES, SEE “UNDERWRITING” IN THIS PROSPECTUS SUPPLEMENT.

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SUMMARY OF THE OFFERING

This summary highlights selected information from this prospectus supplement and the accompanying prospectus and may not contain all of the information that is important to you. To understand the terms of the Notes, you should carefully read this prospectus supplement and the accompanying prospectus.

Issuer The Republic of Korea.

Notes US$500,000,000 aggregate principal amount of 2.000% notes due 2024 and US$1,000,000,000 aggregate principal amount of 2.500% notes due 2029.

Maturity Date The 2024 Notes will mature on June 19, 2024 and the 2029 Notes will mature on June 19, 2029.

Interest The 2024 Notes will bear interest at the rate of 2.000% per year and the 2029 Notes will bear interest at the rate of 2.500% per year. Interest on the Notes will be computed based on a360-day year consisting of twelve30-day months.

Interest Payment Dates Interest on the Notes will be paid twice each year on June 19 and December 19 of each year, beginning on December 19, 2019. Interest on the Notes will accrue from June 19, 2019.

Denominations The Notes will be issued in denominations of US$200,000 principal amount and integral multiples of US$1,000 in excess thereof.

Redemption The Republic may not redeem the Notes prior to maturity.

Form and Settlement The Republic will issue the Notes in the form of one or more fully registered global notes, registered in the name of a nominee of The Depository Trust Company (“DTC”). Except as described in the accompanying prospectus under “Description of the Debt Securities—Global Securities” and in this prospectus supplement under “Description of the Notes—Form and Registration— Certificated Notes”, the global notes will not be exchangeable for Notes in definitive registered form and will not be issued in definitive registered form. Financial institutions, acting as direct and indirect participants in DTC will represent your beneficial interests in the global notes. These financial institutions will record the ownership and transfer of your beneficial interest through book-entry accounts. You may hold your beneficial interests in the Notes through Euroclear Bank SA/NV (“Euroclear”) or Clearstream Banking S.A. (“Clearstream”) if you are a participant in such systems, or indirectly through organizations that are participants in such systems. Any secondary market trading of book-entry interests in the Notes will take place through DTC participants, including Euroclear and Clearstream. See “Clearance and Settlement”.

Listing and Markets Approvalsin-principle have been received from the Singapore Stock Exchange for the listing and quotation of the Notes on the Singapore

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Stock Exchange. For so long as the Notes are listed on the Singapore Stock Exchange and the rules of the Singapore Stock Exchange so require, the Notes, if traded on the Singapore Stock Exchange, will be traded in a minimum board lot size of S$200,000 (or its equivalent in foreign currencies). Accordingly, the Notes, if traded on the Singapore Stock Exchange, will be traded in a minimum board lot size of US$200,000. The Republic will offer the Notes for sale in countries in the Americas, Europe, Asia and elsewhere where it is legal to make such offers.

Status of Notes The Notes will constitute direct, general, unconditional, and unsubordinated External Indebtedness (as defined in “Descriptionof the Debt Securities—Status of Debt Securities” in the accompanying prospectus) of the Republic for which the full faith and credit of the Republic is pledged. The Notes will rank without any preference among themselves and equally with all other unsubordinated External Indebtedness of the Republic. It is understood that this provision shall not be construed so as to require the Republic to make payments under the Notes ratably with payments being made under any other External Indebtedness of the Republic. See “Description of the Notes—Status of the Notes” in this prospectus supplement and “Description of the Debt Securities—Status of Debt Securities” in the accompanying prospectus.

Negative Pledge Subject to certain exceptions, if any of the Notes are outstanding, the Republic will not create or permit to subsist any Security Interest (as defined in “Description of the Debt Securities—Negative Pledge Covenant” in the accompanying prospectus) on the Republic’s assets as security for any of the Republic’s Public External Indebtedness (as defined in “Description of the Debt Securities—Negative Pledge Covenant” in the accompanying prospectus), unless the Notes are secured equally and ratably with such Public External Indebtedness. See “Description of the Debt Securities—Negative Pledge Covenant” in the accompanying prospectus.

Delivery of the Notes The Republic expects to make delivery of the Notes, against payment insame-day funds on or about June 19, 2019, which the Republic expects will be the business day following the date of this prospectus supplement, referred to as “T+5”. You should note that initial trading of the Notes may be affected by the “T+5” settlement. See “Underwriting—Delivery of the Notes” in this prospectus supplement.

Taxation The Republic will make all payments of principal of and interest on the Notes without withholding or deducting any present or future taxes imposed by the Republic or any of its political subdivisions, unless required by law. In that event, the Republic will pay additional amounts as necessary to ensure that you receive the same amount as you would have received without such withholding or deduction, subject to certain exceptions provided in the accompanying prospectus. See “Description of the Debt Securities—Additional

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Amounts” in the accompanying prospectus. For a description of certain United States tax aspects of the Notes, see “Taxation—United States Tax Considerations” in the accompanying prospectus.

Fiscal Agent The Bank of New York Mellon.

Further Issues The Republic may, without the consent of the holders of the Notes, create and issue additional debt securities with the same terms and conditions as the Notes (except for the public offering price and issue date) and consolidate such additional debt securities to form a single series with the Notes. See “Description of the Debt Securities— Further Issues of Debt Securities” in the accompanying prospectus.

Use of Proceeds The 2029 Notes:

The net proceeds from the sale of the 2029 Notes will become part of the Foreign Exchange Stabilization Fund established and managed under the Korean Foreign Exchange Transactions Act. See “Use of Proceeds” in the accompanying prospectus.

The 2024 Notes:

The net proceeds from the sale of the 2024 Notes will become part of the Foreign Exchange Stabilization Fund established and managed under the Korean Foreign Exchange Transactions Act, and will be allocated toward the financing and/or refinancing, in whole or in part, of projects in the Eligible Green Categories (as defined in the “Use of Proceeds” section of this prospectus supplement) and/or a combination of the Eligible Green Categories and the Eligible Social Categories (as defined in the “Use of Proceeds” section of this prospectus supplement) in accordance with certain prescribed eligibility criteria as described under the Green and Sustainability Bond Framework of The Republic of Korea. See “Use of Proceeds” in this prospectus supplement.

Governing Law The Notes and the fiscal agency agreement will be governed by the laws of the State of New York. The laws of the Republic will govern all matters governing the authorization, execution and delivery of the Notes and the fiscal agency agreement by the Republic.

Enhanced Collective Action Clauses The Notes will be designated “enhanced collective action debt securities” (as defined in “Description of the Debt Securities—Events of Default—Enhanced Collective Action Debt Securities” and “Description of the Debt Securities—Modifications and Amendments; Debt Securityholders’ Meetings—Enhanced Collective Action DebtSecurities” in the accompanying prospectus) and will contain certain provisions, commonly referred to in this prospectus supplement and the accompanying prospectus as “enhanced collective action clauses”, regarding acceleration and voting on amendments, modifications and

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waivers. As such, the Notes will contain provisions under which the Republic may, among other things, amend the payment provisions and certain other material terms of the Notes with the consent of the holders of: (1) with respect to a single series of debt securities, more than 75% of the aggregate principal amount of the outstanding debt securities of such series; (2) with respect to two or more series of debt securities, if certain “uniformly applicable” requirements are met, more than 75% of the aggregate principal amount of the outstanding debt securities of all series affected by the proposed modification, taken in the aggregate; or (3) with respect to two or more series of debt securities, whether or not the “uniformly applicable” requirements are met, more than 66 2/3% of the aggregate principal amount of the outstanding debt securities of all series affected by the proposed modification, taken in the aggregate, and more than 50% of the aggregate principal amount of the outstanding debt securities of each series affected by the proposed modification, taken individually. See “Description of the Debt Securities—Events of Default—Enhanced Collective Action Debt Securities” and “Description of the Debt Securities—Modifications and Amendments; Debt Securityholders’ Meetings—Enhanced Collective Action Debt Securities” in the accompanying prospectus.

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USE OF PROCEEDS

The 2029 Notes

The net proceeds from the sale of the 2029 Notes will become part of the Foreign Exchange Stabilization Fund established and managed under the Korean Foreign Exchange Transactions Act. See “Use of Proceeds” in the accompanying prospectus.

The 2024 Notes

The net proceeds from the sale of the 2024 Notes will become part of the Foreign Exchange Stabilization Fund established and managed under the Korean Foreign Exchange Transactions Act, and will be allocated toward the financing and/or refinancing, in whole or in part, of projects in the Eligible Green Categories (as defined below) and/or a combination of the Eligible Green Categories and the Eligible Social Categories (as defined below) in accordance with the Green and Sustainability Bond Framework of The Republic of Korea (the “Framework”).

Eligible Green Categories, Eligible Social Categories or a combination of the two categories have been defined in accordance with the broad categorization of eligibility for Green Projects, Social Projects or Sustainability Projects set out by the International Capital Markets Association (“ICMA”) Green Bond Principles, the ICMA Social Bond Principles and the ICMA Sustainability Bond Guidelines. The eligibility criteria under the Framework are also aligned with the United Nations Sustainable Development Goals, a collection of 17 global goals set by the United Nations General Assembly in 2015 for the year 2030.

“Eligible Green Categories” are those which comprise financing within the Eligible Green Categories set out in the Framework. Such Eligible Green Categories include the following:

• Green buildings: construction and renovation of new and existing buildings that have received or are expected to receive a recognized green building certification, such as the Green Standard for Energy and Environmental Design;

• Waste management andwaste-to-energy: prevention, treatment, management and recycling of waste, as well as development ofwaste-to-energy technologies, such as air emissions abatement technology;

• Water and wastewater management: promotion of sustainable management of water resources, including wastewater prevention, sewage treatment and leakage reduction;

• Renewable energy: development, manufacture, installation and operation of renewable energy sources, including wind energy, solar energy and hydro energy;

• Clean transportation: development, construction and operation oflow-carbon public transportation, including electric rail, urban metro and electric buses, as well as research, development and manufacture of electric vehicles and charging infrastructures; and

• Energy efficiency: design, construction, installation and operation of energy-efficient buildings and other infrastructures, including district cooling systems and smart meters.

“Eligible Social Categories” are those which comprise financing within the Eligible Social Categories set out in the Framework. Such financings aim to provide essential services and enhance socioeconomic advancement by providing free or affordable alternative services to underserved populations. Such Eligible Social Categories include the following:

• Healthcare: promotion of access to hospitals, clinics and healthcare centers for the provision of medical services, including, but not limited to, elderly care;

• Education: development and operation of schools and related facilities to improve the quality of education, promote learning opportunities and facilitate socioeconomic advancement and empowerment for the underprivileged;

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• Affordable basic structure: development of, and provision of access to, basic infrastructure such as energy, communication and hygiene infrastructure forlow-income households; and

• Venture investment: cultivation of eligible ventures andstart-up companies to promote job creation and economic growth.

The examples of the above categories are for illustrative purposes only and no assurance can be provided that disbursements for projects with these specific characteristics will be made by the Republic during the term of the 2024 Notes.

Project Evaluation and Selection Process

The Korea Investment Corporation (“KIC”), the Republic’s sovereign wealth fund, which will manage the net proceeds from the sale of the 2024 Notes, will review eligible projects on a quarterly basis under an investment management agreement (the “IMA”) it entered into with the Ministry of Economy and Finance. Under such agreement, eligible projects will be assessed and identified using the criteria set forth in the Framework. The KIC’s steering committee, its top decision-making body comprised of professionals appointed by the President of the Republic andex-officio members (including the Ministry of Economy and Finance), will supervise the overall management policy of the IMA. The KIC will not knowingly use the net proceeds from the sale of the 2024 Notes to finance or invest in companies involved in certain specific categories, including child labor, production or trade of alcohol, tobacco and weapons, and conflict minerals.

Management of Proceeds

The KIC will manage the net proceeds from the sale of the 2024 Notes by allocating such funds to eligible projects in the form of (i) direct investment; (ii) investment in funds, trusts or special purpose vehicles that are thematically focused only on the eligible categories; or (iii) investment in private equities in companies that derive at least 90% of its annual turnover from the eligible categories. The use of the net proceeds from the sale of the 2024 Notes will also be monitored by the KIC, which will record the details of each allocation and report them to the Ministry of Economy and Finance, which will verify such details against its own records, on an annual basis. Any balance of the proceeds not yet earmarked to eligible projects will be held in accordance with the IMA, and may be temporarily invested in environmental, social and governance funds or liquid money market instruments.

Reporting

The KIC will publish a “Green and Sustainability Bond Report” that will include a summary of the financings during the reporting period, allocation reporting and impact reporting, on an annual basis until the proceeds have been completely allocated and as necessary in the event of material developments. Sustainalytics, an external consultant, issued an opinion dated June 4, 2019 in connection with its independent assessment of the Framework’s alignment with the ICMA Green Bond Principles, the ICMA Social Bond Principles and the ICMA Sustainability Bond Guidelines (the “Second Party Opinion”). The Framework, the Green and Sustainability Bond Report and the Second Party Opinion will be publicly available on the following website: http://kic.kr/en/02/03/05.jsp. None of the Framework, the Green and Sustainability Bond Report or the Second Party Opinion is incorporated into, or forms a part of, this prospectus supplement.

Investment Considerations

There is currently no market consensus on what precise attributes are required for a particular project or series of notes to be defined as “green” or “social,” and therefore no assurance can be provided to investors that selected projects will meet all investor expectations regarding environmental or social performance. Although the projects will be selected in accordance with the categories recognized under the Framework, and will be

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developed in accordance with relevant legislation and standards, there can be no guarantee that the projects will deliver the benefits as anticipated, or that adverse environmental and/or social impacts will not occur during the design, construction, commissioning and operation of the projects. In addition, where any negative impacts are insufficiently mitigated, the projects may become controversial and may be criticized by activist groups or other stakeholders.

The Second Party Opinion may not reflect the potential impact of all risks related to the structure, market, additional risks discussed above and other factors that may affect the value of the 2024 Notes. The Second Party Opinion is not a recommendation to buy, sell or hold securities and is only current as of the date that the Second Party Opinion was initially issued. In addition, although the Republic has agreed to certain reporting and use of proceeds obligations in connection with certain criteria, the Republic’s failure to comply with such obligations does not constitute a breach or an event of default under the 2024 Notes. A withdrawal of the Second Party Opinion or any failure by the Republic to use an amount equivalent to the net proceeds from the issuance of the 2024 Notes as set forth in the Framework or to meet or continue to meet the investment requirements of certain environmentally or socially focused investors with respect to the 2024 Notes may affect the value of the 2024 Notes and may have consequences for certain investors with portfolio mandates to invest in “green” or “social” assets.

No assurance can be provided with respect to the suitability of the Second Party Opinion or that the 2024 Notes will fulfil the environmental and sustainability criteria to qualify as “green” or “social” bonds. Each potential purchaser of the 2024 Notes should determine for itself the relevance of the information contained in this prospectus supplement regarding the use of proceeds and its purchase of the 2024 Notes should be based upon such investigation as it deems necessary.

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RECENT DEVELOPMENTS

This section provides information that supplements the information about the Republic included under the headings corresponding to the headings below in the accompanying prospectus dated May 15, 2019. Defined terms used in this section have the meanings given to them in the accompanying prospectus. If the information in this section differs from the information in the accompanying prospectus, you should rely on the information in this section.

The Economy

Gross Domestic Product

Based on preliminary data, GDP growth in the first quarter of 2019 was 1.7% at chained 2010 year prices, as aggregate private and general government consumption expenditures increased by 2.8% and imports of goods and services decreased by 5.1%, which more than offset a decrease in gross domestic fixed capital formation by 8.6% and a decrease in exports of goods and services by 0.2%, each compared with the corresponding period of 2018.

Principal Sectors of the Economy

Prices, Wages and Employment

The inflation rate was 0.5% in the first quarter of 2019. The unemployment rate was 4.5% in the first quarter of 2018.

The Financial System

Securities Markets

The Korea Composite Stock Price Index was 2,203.6 on April 30, 2019, 2,041.7 on May 31, 2019 and 2,103.9 on June 11, 2019.

Monetary Policy

Foreign Exchange

The market average exchange rate between the Won and the U.S. Dollar (in Won per one U.S. Dollar) as announced by the Seoul Money Brokerage Service Ltd. was Won 1,158.2 to US$1.00 on April 30, 2019, Won 1,190.0 to US$1.00 on May 31, 2019 and Won 1,184.0 to US$1.00 on June 11, 2019.

Balance of Payments and Foreign Trade

Balance of Payments

Based on preliminary data, the Republic recorded a current account surplus of approximately US$11.3 billion in the first quarter of 2019. The current account surplus in the first quarter of 2019 decreased from the current account surplus of US$11.7 billion in the corresponding period of 2018, primarily due to a decrease in surplus from the goods account which more than offset a decrease in deficit from the service account.

Trade Balance

Based on preliminary data, the Republic recorded a trade surplus of US$9.3 billion in the first quarter of 2019. Exports decreased by 8.5% to US$132.7 billion and imports decreased by 6.8% to US$123.4 billion from US$145.1 billion of exports and US$132.4 billion of imports, respectively, in the corresponding period of 2018.

Foreign Currency Reserves

The amount of the Government’s foreign currency reserves was US$404.0 billion as of April 30, 2019.

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Debt

The Government estimates that the total outstanding debt of the Government (including guarantees by the Government) as of December 31, 2018 amounted to approximatelyW680.7 trillion, an increase of 5.0% over the previous year. The Ministry of Economy and Finance administers the national debt of the Republic.

External and Internal Debt of the Government

The following table sets out, by currency and the equivalent amount in U.S. dollars, the estimated outstanding direct external debt of the Government as of December 31, 2018:

Direct External Debt of the Government

	Amount in Original Currency		Equivalent Amount in U.S. Dollars(1)
	(millions)
US$		US$    5,900.0		US$    5,900.0
Euro (EUR)		EUR    1,125.0		1,287.1
Total				US$    7,187.1

(1) Amounts expressed in currencies other than US$ are converted to US$ at the arbitrage rate announced by the Seoul Money Brokerage Services, Ltd. in effect on December 31, 2018.

The following table summarizes, as of December 31 of the years indicated, the outstanding direct internal debt of the Republic:

Direct Internal Debt of the Government

��	(billions of Won)
2014		493,584.9
2015		547,625.6
2016		584,785.0
2017		619,971.9
2018		643,550.9

The following table sets out all guarantees by the Government of indebtedness of others:

Guarantees by the Government

	December 31,
	2014		2015		2016		2017		2018
	(billions of Won)
Domestic		29,158.4		26,393.8		24,241.6		21,130.5		17,016.3
External(1)		—		—		—		—		—
Total		29,158.4		26,393.8		24,241.6		21,130.5		17,016.3

(1) Converted to Won at foreign exchange banks’ telegraphed transfer selling rates to customers or the market average exchange rates in effect on December 31 of each year.

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For further information on the outstanding indebtedness, including guarantees, of the Republic, see “—Tables and Supplementary Information”.

External Liabilities

The following tables set out certain information regarding the Republic’s external liabilities calculated under the criteria based on the sixth edition of Balance of Payment Manual, or BPM6, published by the International Monetary Fund in December 2010 and implemented by the Government in December 2013. Under BPM6, in particular, prepayments received in connection with the construction of ships are excluded from the external liabilities.

	December 31,
	2014		2015		2016		2017		2018(1)
	(billions of dollars)
Long-term Liabilities		307.9		291.7		277.4		296.1		314.0
General Government		65.2		62.8		64.5		78.0		83.5
Monetary Authorities		25.9		20.1		10.8		14.5		15.2
Banks		104.0		103.1		93.8		91.7		100.3
Other Sectors		112.9		105.7		108.2		111.8		115.1
Short-term Liabilities		116.4		104.3		104.8		116.0		126.6
General Government		1.8		2.3		2.5		2.0		1.0
Monetary Authorities		12.2		12.0		6.9		8.1		12.8
Banks		79.9		74.8		78.4		85.5		90.3
Other Sectors		22.5		15.2		17.0		20.4		22.5
Total External Liabilities		424.3		396.1		382.2		412.0		440.6

(1) Preliminary

Debt Record

The Government has always paid when due the full amount of principal of, interest on, and amortization of sinking fund requirements of, all of its indebtedness.

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Tables and Supplementary Information

A. External Debt of the Government

(1) External Bonds of the Government

Series	Issue Date		Maturity Date			Interest Rate (%)		Currency		Original Principal Amount		Principal Amount Outstanding as of December 31, 2018
2005-001		November 2, 2005		November 3, 2025			5.625		USD		400,000,000		400,000,000
2006-002		December 7, 2006		December 7, 2021			4.250		EUR		375,000,000		375,000,000
2009-001		April 16, 2009		April 16, 2019	*		7.125		USD		1,500,000,000		1,500,000,000
2013-001		September 11, 2013		September 11, 2023			3.875		USD		1,000,000,000		1,000,000,000
2014-001		June 10, 2014		June 10, 2044			4.125		USD		1,000,000,000		1,000,000,000
2014-002		June 10, 2014		June 10, 2024			2.125		EUR		750,000,000		750,000,000
2017-001		January 19, 2017		January 19, 2027			2.750		USD		1,000,000,000		1,000,000,000
2018-001		September 20, 2018		September 20, 2028			3.500		USD		500,000,000		500,000,000
2018-002		September 20, 2018		September 20, 2048			3.875		USD		500,000,000		500,000,000
Total External Bonds in Original Currencies													USD 5,900,000,000
													EUR 1,125,000,000
Total External Bonds in Equivalent Amount of Won(1)												W	8,035,845,000,000

* Repaid on the maturity date.

(1) U.S. dollar amounts are converted to Won amounts at the rate of US$1.00 toW1,118.1, the market average exchange rate in effect on December 31, 2018, as announced by Seoul Money Brokerage Services, Ltd. Euro amounts are converted to Won amounts at the rate of EUR 1.00 toW1,279.16, the market average exchange rate in effect on December 31, 2018, as announced by Seoul Money Brokerage Services, Ltd.

(2) External Borrowings of the Government

None.

B. External Guaranteed Debt of the Government

None.

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C. Internal Debt of the Government

Title	Range of Interest Rates		Range of Years of Issue		Range of Years of Original Maturity		Principal Amounts Outstanding as of December 31, 2018
	(%)						(billions of Won)
1. Bonds
Interest-Bearing Treasury Bond for Treasury Bond Management Fund		1.00-5.75		2006-2018		2018-2068		567,044.0
Interest-Bearing Treasury Bond for National Housing I		1.25-3.00		2009-2018		2014-2023		72,545.6
Interest-Bearing Treasury Bond for National Housing II		0.0-3.0		1994-2017		2014-2030		718.9
Interest-Bearing Treasury Bond for National Housing III		0		2005		2015		1.6
Non-interest-Bearing Treasury Bond for Contribution to International Organizations(1)		0		1968-1985		—		9.4
Total Bonds								640,319.6
2. Borrowings
Borrowings from The Bank of Korea		1.362-1.652		2017-2018		2019		716.2
Borrowings from the Sports Promotion Fund		1.205-2.275		2016-2018		2019-2020		450.0
Borrowings from The Korea Foundation Fund		1.73-2.34		2017-2018		2019-2020		70.0
Borrowings from the Labor Welfare Promotion Fund		2.13		2018		2019		50.0
Borrowings from Korea Technology Finance Corporation		1.98-2.34		2018		2020-2022		195.0
Borrowings from the Credit Guarantee Fund for Agriculture, Forestry and Fisheries Suppliers		1.875-3.215		2014-2018		2019-2020		1,100.0
Borrowings from the Government Employees’ Pension Fund		1.51		2018		2021		10.0
Borrowings from the Film Industry Development Fund		1.385-2.235		2016-2018		2019-2020		114.0
Borrowings from the Housing Finance Credit Guarantee Fund		1.385-1.67		2016		2019		526.1
Total Borrowings								3,231.3
Total Internal Funded Debt								643,550.9

(1) Interest Rates and Years of Original Maturity not applicable.

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D. Internal Guaranteed Debt of the Government

Title	Range of Interest Rates		Range of Years of Issue		Range of Years of Original Maturity		Principal Amounts Outstanding as of December 31, 2018
	(%)						(billions of Won)
1. Bonds of Government-Affiliated Corporations
Korea Deposit Insurance Corporation		1.34-2.52		2015-2018		2019-2021		5,850.0
Korea Student Aid Foundation		0.00-5.07		2010-2018		2019-2037		11,160.0
Total Bonds								17,010.0
2. Borrowings of Government-Affiliated Corporations
Rural Development Corporation and Federation of Farmland		5.5		1989		2023		6.3
Total Borrowings								6.3
Total Internal Guaranteed Debt								17,016.3

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DESCRIPTION OF THE NOTES

The following is a description of some of the terms of the Notes the Republic is offering. The following description is only a summary. The Republic urges you to read the fiscal agency agreement described below and the form of global note before deciding whether to invest in the Notes. The Republic has filed a copy of these documents with the Securities and Exchange Commission as exhibits to the registration statement.

The Notes are a series of debt securities more fully described in “Description of the Debt Securities” in the accompanying prospectus. The description in this prospectus supplement further adds to that description or, to the extent inconsistent with that description, replaces it.

General

The Republic will issue the Notes under the fiscal agency agreement, dated as of April 17, 1998, as amended by Amendment No. 1 dated June 3, 2003 and Amendment No. 2 dated July 17, 2018, between the Republic and The Bank of New York Mellon, as fiscal agent. The Notes will constitute direct, general, unconditional and unsubordinated obligations of the Republic for which the full faith and credit of the Republic is pledged. The aggregate principal amount of the 2024 Notes will be US$500,000,000 and will mature on June 19, 2024. The aggregate principal amount of the 2029 Notes will be US$1,000,000,000 and will mature on June 19, 2029. The Notes will be issued in denominations of US$200,000 principal amount and integral multiples of US$1,000 in excess thereof.

The Notes will be designated “enhanced collective action debt securities” (as defined in “Description of the Debt Securities—Events of Default—Enhanced Collective Action Debt Securities” and “Description of the Debt Securities—Modifications and Amendments; Debt Securityholders’ Meetings—Enhanced Collective Action Debt Securities” in the accompanying prospectus) and will contain certain provisions, commonly referred to in this prospectus supplement and the accompanying prospectus as “enhanced collective action clauses”, regarding acceleration and voting on amendments, modifications and waivers. As such, the Notes will contain provisions under which the Republic may, among other things, amend the payment provisions and certain other material terms of the Notes with the consent of the holders of: (1) with respect to a single series of debt securities, more than 75% of the aggregate principal amount of the outstanding debt securities of such series; (2) with respect to two or more series of debt securities, if certain “uniformly applicable” requirements are met, more than 75% of the aggregate principal amount of the outstanding debt securities of all series affected by the proposed modification, taken in the aggregate; or (3) with respect to two or more series of debt securities, whether or not the “uniformly applicable” requirements are met, more than 66 2/3% of the aggregate principal amount of the outstanding debt securities of all series affected by the proposed modification, taken in the aggregate, and more than 50% of the aggregate principal amount of the outstanding debt securities of each series affected by the proposed modification, taken individually. See “Description of the Debt Securities—Events of Default— Enhanced Collective Action Debt Securities” and “Description of the Debt Securities—Modifications and Amendments; Debt Securityholders’ Meetings—Enhanced Collective Action Debt Securities” in the accompanying prospectus.

Payment of Principal and Interest

The 2024 Notes

The 2024 Notes will bear interest at 2.000% per year from June 19, 2019. Interest on the 2024 Notes will be payable semi-annually on June 19 and December 19 of each year, beginning on December 19, 2019. Interest payable on the 2024 Notes on any interest payment date will be payable to the person in whose name such 2024 Notes are registered at the close of business on the fifteenth day (whether or not a business day) next preceding such interest payment date, which for so long as the 2024 Notes are in book-entry form will generally be Cede & Co., as DTC’s nominee. Principal of the 2024 Notes will be payable at par. Upon receipt of any payment of principal of or interest on the 2024 Notes, DTC will credit DTC participants’ accounts with payments in amounts proportionate to their respective beneficial interest in the principal amount of 2024 Notes as shown on the

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records of DTC. Payments by DTC participants to owners of beneficial interests in the 2024 Notes held through such participants will be the responsibility of such participants, as is in the case with securities held for accounts of customers registered in “street name”. The Republic will have no responsibility or liability for any aspect of the records relating to, or payments made on account of, beneficial ownership interests in the 2024 Notes or for maintaining, supervising or reviewing any records relating to such beneficial ownership interests.

Principal of and interest on the 2024 Notes will be payable in U.S. dollars or in such other coin or currency of the United States as at the time of payment is legal tender for the payment of public and private debts. Interest on the 2024 Notes will be computed on the basis of a360-day year of twelve30-day months. In any case where the due date for the payment of the principal of or interest on the 2024 Notes will be, at any place from which any check for such payment is to be mailed or where such Note is to be surrendered for payment or, in the case of payments by transfer, where such transfer is to be made, a day on which banking institutions in New York City are authorized or obligated by law to close, then such payment need not be made on such date at such place but may be made on the next succeeding day at such place which is not a day on which banking institutions are authorized or obligated by law to close, with the same force and effect as if made on the date for such payment, and no interest shall be payable in respect of any such delay.

The 2029 Notes

The 2029 Notes will bear interest at 2.500% per year from June 19, 2019. Interest on the 2029 Notes will be payable semi-annually on June 19 and December 19 of each year, beginning on December 19, 2019. Interest payable on the 2029 Notes on any interest payment date will be payable to the person in whose name such 2029 Notes are registered at the close of business on the fifteenth day (whether or not a business day) next preceding such interest payment date, which for so long as the 2029 Notes are in book-entry form will generally be Cede & Co., as DTC’s nominee. Principal of the 2029 Notes will be payable at par. Upon receipt of any payment of principal of or interest on the 2029 Notes, DTC will credit DTC participants’ accounts with payments in amounts proportionate to their respective beneficial interest in the principal amount of 2029 Notes as shown on the records of DTC. Payments by DTC participants to owners of beneficial interests in the 2029 Notes held through such participants will be the responsibility of such participants, as is in the case with securities held for accounts of customers registered in “street name”. The Republic will have no responsibility or liability for any aspect of the records relating to, or payments made on account of, beneficial ownership interests in the 2029 Notes or for maintaining, supervising or reviewing any records relating to such beneficial ownership interests.

Principal of and interest on the 2029 Notes will be payable in U.S. dollars or in such other coin or currency of the United States as at the time of payment is legal tender for the payment of public and private debts. Interest on the 2029 Notes will be computed on the basis of a360-day year of twelve30-day months. In any case where the due date for the payment of the principal of or interest on the 2029 Notes will be, at any place from which any check for such payment is to be mailed or where such Note is to be surrendered for payment or, in the case of payments by transfer, where such transfer is to be made, a day on which banking institutions in New York City are authorized or obligated by law to close, then such payment need not be made on such date at such place but may be made on the next succeeding day at such place which is not a day on which banking institutions are authorized or obligated by law to close, with the same force and effect as if made on the date for such payment, and no interest shall be payable in respect of any such delay.

Status of the Notes

The Notes will constitute direct, general, unconditional and unsubordinated External Indebtedness of the Republic for which the full faith and credit of the Republic is pledged. The Notes will rank without any preference among themselves and equally with all other unsubordinated External Indebtedness of the Republic. It is understood that this provision shall not be construed so as to require the Republic to make payments under the Notes ratably with payments being made under any other External Indebtedness of the Republic. See “Description of the Debt Securities—Status of Debt Securities” in the accompanying prospectus.

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Redemption

The Republic may not redeem the Notes prior to maturity. At maturity, the Republic will redeem the Notes at par.

Purchase of Notes by the Republic

The Republic may at any time purchase or acquire any of the Notes in any manner and at any price. The Notes which are purchased or acquired by the Republic may, at the Republic’s discretion, be held, resold or surrendered to the fiscal agent for cancellation.

Governing Law

The Notes and the fiscal agency agreement will be governed by the laws of the State of New York. The laws of Korea will govern all matters governing the authorization, execution and delivery of the Notes and the fiscal agency agreement by the Republic.

Notices

Notices will be mailed to holders of the Notes (which will be a nominee of DTC as long as the Notes are held in global form) at their registered addresses and shall be deemed to have been given on the date of such mailing. The Republic will ensure that notices are duly given or published in a manner which complies with the rules and regulations of any stock exchange on which the Notes are for the time being listed. The Notes are expected to be listed on the Singapore Stock Exchange.

Fiscal Agent

The duties of the fiscal agent will be governed by the fiscal agency agreement. The Republic may maintain deposit accounts and conduct other banking transactions in the ordinary course of business with the fiscal agent. The fiscal agent is the agent of the Republic, is not a trustee for the holders of the Notes and does not have the same responsibilities or duties to act for such holders as would a trustee.

For so long as the Notes are listed on the Singapore Stock Exchange and the rules of the Singapore Stock Exchange so require, in the event any global notes are exchanged for certificated notes, the Republic will appoint and maintain a paying agent in Singapore, where the certificated notes may be presented or surrendered for payment or redemption. In addition, in the event any global notes are exchanged for certificated notes, an announcement of such exchange will be made by or on behalf of the Republic through the Singapore Stock Exchange. Such announcement will include all material information with respect to the delivery of the certificated notes, including details of the paying agent in Singapore.

Form and Registration

General

The Notes will be represented by one or more fully registered global notes, which will be deposited with a custodian for, and registered in the name of a nominee of, DTC. Except in the limited circumstances described under “—Certificated Notes” below, beneficial interests in the Notes will only be recorded by book-entry and owners of beneficial interests in the Notes will not be entitled to receive physical delivery of certificated notes representing the Notes.

Global Notes

Upon the issuance of the global notes for the Notes, DTC or its nominee will credit, on its internal system, the respective principal amounts of the individual beneficial interests represented by such global notes to the

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accounts of persons who have accounts with DTC. Such accounts initially will be designated by or on behalf of the underwriters. Ownership of beneficial interests in a global note for the Notes will be limited to persons (including Euroclear and Clearstream) who have accounts with DTC (“DTC participants”) or persons who hold interests through DTC participants. Ownership of beneficial interests in the global notes for the Notes will be shown on, and the transfer of that ownership will be effected only through, records maintained by DTC or its nominee (with respect to interests of DTC participants) and the records of agent members (with respect to interests of persons other than DTC participants).

So long as DTC or its nominee is the holder of a global note for the Notes, DTC or its nominee, as the case may be, will be considered the holder of the Notes represented by such global note for all purposes under the fiscal agency agreement and the Notes. No beneficial owner of an interest in a global note for the Notes will be able to transfer that interest except in accordance with DTC’s applicable procedures (in addition to those under the Notes referred to in this prospectus supplement and, if applicable, those of Euroclear and Clearstream) unless the Republic issues certificated notes as described under “—Certificated Notes” below.

Investors may hold their interests in the global notes for the Notes directly through DTC, if they are participants, or indirectly through organizations that are DTC participants, including Euroclear and Clearstream. Euroclear and Clearstream will hold interests in the global notes on behalf of their DTC participants through their respective depositaries, which in turn will hold such interests in such global notes in customers’ securities accounts in the depositaries’ names on the books of DTC.

Payments of the principal of and interest on the global notes for the Notes will be made to DTC or its nominee, as the holder of such global notes. None of the Republic, the underwriters or the fiscal agent will have any responsibility or liability for any aspect of the records relating to or payments made to an account of beneficial ownership interests in the global notes for the Notes or for maintaining, supervising or reviewing any records relating to such beneficial ownership interests.

The Republic expects that DTC or its nominee, upon receipt of any payment of principal of or interest on a global note for the Notes held by it or its nominee, will immediately credit DTC participants’ accounts with payments in amounts proportionate to their respective beneficial interests in the principal amount of such global note as shown on the records of DTC or its nominee. The Republic also expects that payments by DTC participants to owners of beneficial interests in such global note held through such participants will be governed by standing instructions and customary practices. Such payments will be the responsibility of such participants.

DTC will take any action permitted to be taken by a holder of the Notes (including the presentation of Notes for exchange as described below) only at the direction of one or more DTC participants to whose DTC account interests in the global notes are credited, and only in respect of such portion of the aggregate principal amount of the Notes as to which such DTC participant or DTC participants has or have given such direction.

Certificated Notes

The Republic will issue certificated notes in exchange for the global notes if:

• DTC or any successor depositary notifies the Republic that it is unwilling or unable to continue as a depositary for such global notes or ceases to be a “clearing agency” registered under the Securities Exchange Act of 1934, as amended (the “Exchange Act”); or

• the Republic, in its sole discretion, executes and delivers to the fiscal agent an order that such global notes will be exchangeable into certificated notes.

For so long as the Notes are listed on the Singapore Stock Exchange and the rules of the Singapore Stock Exchange so require, in the event any global notes are exchanged for certificated notes, an announcement of such exchange will be made by or on behalf of the Republic through the Singapore Stock Exchange. Such announcement will include all material information with respect to the delivery of the certificated notes, including details of the paying agent in Singapore.

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The holder of a certificated note may transfer such certificated note by surrendering it at the office maintained for such purpose in the Borough of Manhattan, the City of New York, which initially will be the office of the fiscal agent.

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CLEARANCE AND SETTLEMENT

The Republic has obtained the information in this section from sources it believes to be reliable, including from DTC, Euroclear and Clearstream. The Republic accepts responsibility only for accurately extracting information from such sources. DTC, Euroclear and Clearstream are under no obligation to perform or continue to perform the procedures described below, and they may modify or discontinue them at any time. Neither the Republic nor the registrar will be responsible for DTC’s, Euroclear’s or Clearstream’s performance of their obligations under their rules and procedures. Nor will the Republic or the registrar be responsible for the performance by direct or indirect participants of their obligations under their rules and procedures.

Introduction

The Depository Trust Company

DTC is:

• a limited-purpose trust company organized under the New York Banking Law;

• a “banking organization” under the New York Banking Law;

• a member of the Federal Reserve System;

• a “clearing corporation” under the New York Uniform Commercial Code; and

• a “clearing agency” registered under Section 17A of the Exchange Act.

DTC was created to hold securities for its DTC participants and facilitate the clearance and settlement of securities transactions between its DTC participants. It does this through electronic book-entry changes in the accounts of its direct DTC participants, eliminating the need for physical movement of securities certificates. DTC is owned by a number of its direct DTC participants and by the New York Stock Exchange Inc., the American Stock Exchange, Inc. and the National Association of Securities Dealers Inc.

Euroclear and Clearstream

Like DTC, Euroclear and Clearstream hold securities for their Euroclear/Clearstream participants and facilitate the clearance and settlement of securities transactions between their Euroclear/Clearstream participants through electronic book-entry changes in their accounts. Euroclear and Clearstream provide various services to their Euroclear/Clearstream participants, including the safekeeping, administration, clearance and settlement and lending and borrowing of internationally traded securities. Participants in Euroclear and Clearstream are financial institutions such as underwriters, securities brokers and dealers, banks and trust companies. Some of the underwriters participating in this offering are participants in Euroclear or Clearstream. Other banks, brokers, dealers and trust companies have indirect access to Euroclear or Clearstream by clearing through or maintaining a custodial relationship with a Euroclear or Clearstream participant.

Ownership of the Notes through DTC, Euroclear and Clearstream

The Republic will issue the Notes in the form of one or more fully registered global notes, registered in the name of a nominee of DTC. Financial institutions, acting as direct and indirect participants in DTC, will represent your beneficial interests in the global notes. These financial institutions will record the ownership and transfer of your beneficial interests through book-entry accounts. You may hold your beneficial interests in the global notes through Euroclear or Clearstream, if you are a DTC participant in such systems, or indirectly through organizations that are DTC participants in such systems. Euroclear and Clearstream will hold their Euroclear/Clearstream participants’ beneficial interests in the global notes in their customers’ securities accounts with their depositaries. These depositaries of Euroclear and Clearstream in turn will hold such interests in their customers’ securities accounts with DTC.

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The Republic and the fiscal agent generally will treat the registered holder of the Notes, initially Cede & Co., as the absolute owner of the Notes for all purposes. Once the Republic and the fiscal agent make payments to the registered holder, the Republic and the fiscal agent will no longer be liable on the Notes for the amounts so paid. Accordingly, if you own a beneficial interest in the global notes, you must rely on the procedures of the institutions through which you hold your interests in the Notes, including DTC, Euroclear, Clearstream and their respective participants, to exercise any of the rights granted to holders of Notes. Under existing industry practice, if you desire to take any action that Cede & Co., as the holder of the global notes, is entitled to take, then Cede & Co. would authorize the DTC participant through which you own your beneficial interest to take such action. The DTC participant would then either authorize you to take the action or act for you on your instructions.

DTC may grant proxies or authorize its DTC participants, or persons holding beneficial interests in the Notes through such DTC participants, to exercise any rights of a holder or take any actions that a holder is entitled to take under the fiscal agency agreement or the Notes. Euroclear’s or Clearstream’s ability to take actions as holder under the Notes or the fiscal agency agreement will be limited by the ability of their respective depositaries to carry out such actions for them through DTC. Euroclear and Clearstream will take such actions only in accordance with their respective rules and procedures.

The fiscal agent will not charge you any fees for the Notes, other than reasonable fees and indemnity satisfactory to the fiscal agent for the replacement of lost, stolen, mutilated or destroyed Notes. However, you may incur fees for the maintenance and operation of the book-entry accounts with the clearing systems in which your beneficial interests are held.

Transfers Within and Between DTC, Euroclear and Clearstream

Trading Between DTC Purchasers and Sellers

DTC participants will transfer interests in the Notes among themselves in the ordinary way according to DTC rules. DTC participants will pay for such transfers by wire transfer. The laws of some states require certain purchasers of securities to take physical delivery of the securities in definitive form. These laws may impair your ability to transfer beneficial interests in the global notes to such purchasers. DTC can act only on behalf of its direct DTC participants, who in turn act on behalf of indirect DTC participants and certain banks. Thus, your ability to pledge a beneficial interest in the global notes to persons that do not participate in the DTC system, and to take other actions, may be limited because you will not possess a physical certificate that represents your interest.

Trading Between Euroclear and/or Clearstream Participants

Euroclear/Clearstream participants will transfer interests in the Notes among themselves according to the rules and operating procedures of Euroclear and Clearstream.

Trading Between a DTC Seller and a Euroclear or Clearstream Purchaser

When the Notes are to be transferred from the account of a DTC participant to the account of a Euroclear or Clearstream participant, the purchaser must first send instructions to Euroclear or Clearstream through a participant at least one business day prior to the settlement date. Euroclear or Clearstream will then instruct its depositary to receive the Notes and make payment for them. On the settlement date, the depositary will make payment to the DTC participant’s account, and the Notes will be credited to the depositary’s account. After settlement has been completed, DTC will credit the Notes to Euroclear or Clearstream, Euroclear or Clearstream will credit the Notes, in accordance with its usual procedures, to the participant’s account, and the participant will then credit the purchaser’s account. These securities credits will appear the next day (European time) after the settlement date. The cash debit from the account of Euroclear or Clearstream will be back-valued to the value date, which will be the preceding day if settlement occurs in New York. If settlement is not completed on the intended value date (i.e., the trade fails), the cash debit will instead be valued at the actual settlement date.

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Participants in Euroclear and Clearstream will need to make funds available to Euroclear or Clearstream to pay for the Notes by wire transfer on the value date. The most direct way of doing this is topre-position funds (i.e., have funds in place at Euroclear or Clearstream before the value date), either from cash on hand or existing lines of credit. Under this approach, however, participants may take on credit exposure to Euroclear and Clearstream until the Notes are credited to their accounts one day later.

As an alternative, if Euroclear or Clearstream has extended a line of credit to a participant, the participant may decide not topre-position funds, but to allow Euroclear or Clearstream to draw on the line of credit to finance settlement for the Notes. Under this procedure, Euroclear or Clearstream would charge the participant overdraft charges for one day, assuming that the overdraft would be cleared when the Notes were credited to the participant’s account. However, interest on the Notes would accrue from the value date. Therefore, in many cases the interest income on the Notes which the participant earns during thatone-day period will substantially reduce or offset the amount of the participant’s overdraft charges. Of course, this result will depend on the cost of funds (i.e., the interest rate that Euroclear or Clearstream charges) to each participant.

Since the settlement will occur during New York business hours, a DTC participant selling an interest in the Notes can use its usual procedures for transferring global securities to the depositories of Euroclear or Clearstream for the benefit of Euroclear or Clearstream participants. The DTC seller will receive the sale proceeds on the settlement date. Thus, to the DTC seller, a cross-market sale will settle no differently than a trade between two DTC participants.

Trading Between a Euroclear or Clearstream Seller and a DTC Purchaser

Due to time-zone differences in their favor, Euroclear and Clearstream participants can use their usual procedures to transfer Notes through their depositaries to a DTC participant. The seller must first send instructions to Euroclear or Clearstream through a participant at least one business day prior to the settlement date. Euroclear or Clearstream will then instruct its depositary to credit the Notes to the DTC participant’s account and receive payment. The payment will be credited in the account of the Euroclear or Clearstream participant on the following day, but the receipt of the cash proceeds will be back-valued to the value date, which will be the preceding day if settlement occurs in New York. If settlement is not completed on the intended value date (i.e., the trade fails), the receipt of the cash proceeds will instead be valued at the actual settlement date.

If the Euroclear or Clearstream participant selling the Notes has a line of credit with Euroclear or Clearstream and elects to be in debit for the Notes until it receives the sale proceeds in its account, then the back-valuation may substantially reduce or offset any overdraft charges that the participant incurs over that period.

Settlement in other currencies between DTC and Euroclear and Clearstream is possible usingfree-of-payment transfers to move the Notes, but funds movement will take place separately.

Finally, day traders who use Euroclear or Clearstream and who purchase Notes from DTC participants for credit to Euroclear participants or Clearstream participants should note that these trades will automatically fail unless one of three steps is taken:

• borrowing through Euroclear or Clearstream for one day, until the purchase side of the day trade is reflected in the day trader’s Euroclear or Clearstream account, in accordance with the clearing system’s customary procedures;

• borrowing the Notes in the United States from DTC participants no later than one day prior to settlement, which would allow sufficient time for the Notes to be reflected in the Euroclear or Clearstream account in order to settle the sale side of the trade; or

• staggering the value dates for the buy and sell sides of the trade so that the value date for the purchase from the DTC participant is at least one day prior to the value date for the sale to the Euroclear or Clearstream participant.

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TAXATION

Korean Taxation

For a discussion of certain Korean tax considerations that may be relevant to you if you invest in the Notes, see “Taxation—Korean Taxation” in the accompanying prospectus.

United States Tax Considerations

Stated interest on the Notes will be treated as qualified stated interest for U.S. federal income tax purposes. For a discussion of certain U.S. federal income tax considerations that may be relevant to you if you invest in the Notes, see “Taxation—United States Tax Considerations” in the accompanying prospectus.

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UNDERWRITING

Relationship with the Underwriters

The Republic and the underwriters named below have entered into a Terms Agreement dated June 12, 2019 (the “Terms Agreement”) with respect to the Notes relating to the Underwriting Agreement—Standard Terms (Debt Securities) (together with the Terms Agreement, the “Underwriting Agreement”) filed as an exhibit to the registration statement. Citigroup Global Markets Inc., Credit Agricole Corporate and Investment Bank, The Hongkong and Shanghai Banking Corporation Limited and J.P. Morgan Securities LLC are acting as representatives of the underwriters. Subject to the terms and conditions set forth in the Underwriting Agreement, the Republic has agreed to sell to each of the underwriters, and each of the underwriters has severally agreed to purchase, the following principal amounts of the Notes set out opposite its name below:

Name of underwriters	Principal Amount of the 2024 Notes		Principal Amount of the 2029 Notes
Citigroup Global Markets Inc.	US$	125,000,000	US$	250,000,000
Credit Agricole Corporate and Investment Bank		125,000,000		250,000,000
The Hongkong and Shanghai Banking Corporation Limited		125,000,000		250,000,000
J.P. Morgan Securities LLC		125,000,000		250,000,000
Total	US$	500,000,000	US$	1,000,000,000

The Underwriting Agreement provides that the underwriters are obligated to purchase all of the Notes if any are purchased. The Underwriting Agreement also provides that if an underwriter defaults, the purchase commitment of thenon-defaulting underwriters may be increased or the offering of the Notes may be terminated.

The underwriters initially propose to offer the Notes at the public offering price described on the cover page of this prospectus supplement. After the offering of the Notes, the underwriters may from time to time change the public offering price and other selling terms. The underwriters may offer the Notes in various jurisdictions through certain of their respective affiliates. The offering of the Notes by the underwriters is subject to receipt and acceptance and subject to the underwriters’ right to reject any order in whole or in part.

Any underwriter who is not registered as a broker-dealer with the Securities and Exchange Commission will not engage in any transaction related to the Notes in the United States except as permitted by the Exchange Act. Credit Agricole Corporate and Investment Bank and The Hongkong and Shanghai Banking Corporation Limited will offer the Notes in the United States through their respective registered broker-dealer affiliates in the United States, Credit Agricole Securities (USA) Inc. and HSBC Securities (USA) Inc., respectively.

The Notes are a new class of securities with no established trading market. Approvalsin-principle have been received from the Singapore Stock Exchange for the listing and quotation of the Notes on the Singapore Stock Exchange. For so long as the Notes are listed on the Singapore Stock Exchange and the rules of the Singapore Stock Exchange so require, the Notes, if traded on the Singapore Stock Exchange, will be traded in a minimum board lot size of S$200,000 (or its equivalent in foreign currencies). Accordingly, the Notes, if traded on the Singapore Stock Exchange, will be traded in a minimum board lot size of US$200,000. The underwriters have advised the Republic that they intend to make a market in the Notes. However, they are not obligated to do so, and they may discontinue any market-making activities with respect to the Notes at any time without notice. Accordingly, the Republic cannot assure you as to the liquidity of any trading market for the Notes.

The Republic has agreed to indemnify the underwriters against certain liabilities, including liabilities under the Securities Act of 1933, as amended (the “Securities Act”), or to contribute with respect to certain payments which the underwriters may be required to make in respect of any such liabilities.

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In connection with the offering, the underwriters may purchase and sell Notes in the open market. These transactions may include over-allotment, covering transactions, stabilizing transactions and penalty bids. Over-allotment involves sales of Notes in excess of the principal amount of Notes to be purchased by the underwriters in this offering, which creates a short position for the underwriters. Covering transactions involve purchases of the Notes in the open market after the distribution has been completed in order to cover short positions. Stabilizing transactions consist of certain bids or purchases of Notes made for the purpose of preventing or retarding a decline in the market price of the Notes while the offering is in progress. Penalty bids permit the underwriters to reclaim a selling concession from a dealer when the Notes originally sold by such dealer are purchased in a stabilizing transaction or a covering transaction to cover short positions. Any of these activities may have the effect of preventing or retarding a decline in the market price of the Notes. They may also cause the price of the Notes to be higher than the price that otherwise would exist in the open market in the absence of these transactions. The underwriters may conduct these transactions on the Singapore Stock Exchange, in theover-the-counter market or otherwise. If the underwriters commence any of these transactions, they may discontinue them at any time, and must discontinue them after a limited period.

The amount of net proceeds is US$495,080,000 for the 2024 Notes and US$983,060,000 for the 2029 Notes after deducting underwriting discounts but not estimated expenses. The total of the Republic’s expenses for this offering are estimated to be approximately US$200,000. The underwriters have agreed to pay certain of the expenses incurred in connection with the offering of the Notes.

In the ordinary course of their respective businesses, some of the underwriters and/or their respective affiliates have engaged, and may in the future engage, in investment banking, commercial banking, advisory or other services for the Republic for which customary compensation and expense reimbursement has been or will be received.

Delivery of the Notes

The Republic expects to make delivery of the Notes against payment for the Notes insame-day funds on or about June 19, 2019 which will be the fifth business day following the date of this prospectus supplement. Under Rule15c6-1 promulgated under the Exchange Act, U.S. purchasers are generally required to settle trades in the secondary market in two business days, unless they and the other parties to any such trade expressly agree otherwise. Accordingly, if you wish to trade in the Notes on any day prior to the second business day from the settlement, because the Notes will initially settle in T+5, you may be required to specify an alternate settlement cycle at the time of your trade to prevent a failed settlement. Purchasers in other countries should consult with their own advisers.

Non-U.S. Selling Restrictions

No action has been taken in any jurisdiction (except in the United States) that would permit a public offering of the Notes, or the possession, circulation or distribution of this prospectus supplement, the accompanying prospectus or any other material relating to us or the Notes in any jurisdiction where action for that purpose is required. Accordingly, the Notes may not be offered or sold, directly or indirectly, and none of this prospectus supplement, the accompanying prospectus or any other offering material or advertisements in connection with the Notes may be distributed or published, in or from any country or jurisdiction except in compliance with any applicable rules and regulations of any such country or jurisdiction.

Korea

The Notes have not been offered, sold or delivered, and will not be offered, sold or delivered, directly or indirectly, to, or for the account or benefit of, any resident of Korea, except as permitted by applicable Korean laws and regulations. Any securities dealer to whom the Notes are sold will agree that it will not offer any Notes, directly or indirectly, in Korea or to any resident of Korea, except as permitted by applicable Korean laws and regulations, or to any dealer who does not so represent and agree.

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European Economic Area

The Notes are not intended to be offered, sold or otherwise made available to and should not be offered, sold or otherwise made available to any retail investor in the European Economic Area (“EEA”). For these purposes, a retail investor means a person who is one (or more) of: (i) a retail client as defined in point (11) of Article 4(1) of MiFID II; or (ii) a customer within the meaning of Directive 2002/92/EC (“IMD”), where that customer would not qualify as a professional client as defined in point (10) of Article 4(1) of MiFID II. Consequently no key information document required by Regulation (EU) No 1286/2014 (the “PRIIPs Regulation”) for offering or selling the Notes or otherwise making them available to retail investors in the EEA has been prepared and therefore offering or selling the Notes or otherwise making them available to any retail investor in the EEA may be unlawful under the PRIIPs Regulation.

United Kingdom

Each underwriter:

(i) has only communicated or caused to be communicated and will only communicate or cause to be communicated an invitation or inducement to engage in investment activity (within the meaning of Section 21 of the Financial Services and Markets Act 2000, or the FSMA) received by it in connection with the issue or sale of the Notes in circumstances in which Section 21(1) of the FSMA does not apply to the Republic; and

(ii) has complied and will comply with all applicable provisions of the FSMA with respect to anything done by it in relation to the Notes in, from or otherwise involving the United Kingdom.

Japan

The Notes have not been and will not be registered under the Financial Instruments and Exchange Act of Japan. Accordingly, none of the Notes nor any interest therein may be offered or sold, directly or indirectly, in Japan or to, or for the benefit of, any “resident” of Japan (which term as used herein means any person resident in Japan, including any corporation or other entity organized under the laws of Japan) or to others for reoffering or resale, directly or indirectly, in Japan or to, or for the account or benefit of, any resident of Japan except (i) pursuant to an exemption from the registration requirements of, and otherwise in compliance with, the Financial Instruments and Exchange Act of Japan and (ii) in compliance with the other relevant laws, regulations and ministerial guidelines of Japan in effect at the relevant time.

Hong Kong

Each of the underwriters (i) has not offered or sold and will not offer or sell in Hong Kong, by means of any document, any Notes other than (a) to “professional investors” as defined in the Securities and Futures Ordinance (Cap. 571) of Hong Kong (the “SFO”) and any rules made under that Ordinance, or (b) in other circumstances which do not result in the document being a “prospectus” as defined in the Companies (Winding Up and Miscellaneous Provisions) Ordinance (Cap. 32) of Hong Kong or which do not constitute an offer to the public within the meaning of that Ordinance; and (ii) has not issued or had in its possession for the purposes of issue, and will not issue or have in its possession for the purposes of issue, whether in Hong Kong or elsewhere, any advertisement, invitation or document relating to the Notes, which is directed at, or the contents of which are likely to be accessed or read by, the public of Hong Kong (except if permitted to do so under the securities laws of Hong Kong) other than with respect to the Notes which are or are intended to be disposed of only to persons outside Hong Kong or only to “professional investors” as defined in the SFO and any rules made under that Ordinance.

Singapore

This prospectus supplement and the accompanying prospectus have not been and will not be registered as a prospectus with the Monetary Authority of Singapore under the Securities and Futures Act, Chapter 289 of

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Singapore (the “SFA”). Accordingly, the Notes may not be offered or sold, or be made the subject of an invitation for subscription or purchase nor may this prospectus supplement, the accompanying prospectus or any other document or material in connection with the offer or sale, or invitation for subscription or purchase, of the Notes, be circulated or distributed, whether directly or indirectly, to any person in Singapore other than (i) to an institutional investor under Section 274 of the SFA, (ii) to a relevant person pursuant to Section 275(1), or any person pursuant to Section 275(1A), and in accordance with the conditions specified in Section 275, of the SFA or (iii) otherwise pursuant to, and in accordance with the conditions of, any other applicable provision of the SFA.

Where the Notes are subscribed or purchased under Section 275 of the SFA by a relevant person which is:

(a) a corporation (which is not an accredited investor (as defined in Section 4A of the SFA)) the sole business of which is to hold investments and the entire share capital of which is owned by one or more individuals, each of whom is an accredited investor; or

(b) a trust (where the trustee is not an accredited investor) whose sole purpose is to hold investments and each beneficiary of the trust is an individual who is an accredited investor,

securities or securities-based derivatives contracts (each term as defined in the SFA) of that corporation or the beneficiaries’ rights and interest (howsoever described) in that trust shall not be transferred within six months after that corporation or that trust has acquired the Notes pursuant to an offer made under Section 275 of the SFA except:

(1) to an institutional investor or to a relevant person defined in Section 275(2) of the SFA, or to any person arising from an offer referred to in Section 275(1A) or Section 276(4)(i)(B) of the SFA;

(2) where no consideration is or will be given for the transfer;

(3) where the transfer is by operation of law;

(4) as specified in Section 276(7) of the SFA; or

(5) as specified in Regulation 37A of the Securities and Futures (Offers of Investments) (Securities and Securities-based Derivatives Contracts) Regulations 2018 of Singapore.

Republic of Italy

The offering has not been cleared by the Commissione Nazionale per la Società e la Borsa (“CONSOB”) (the Italian securities exchange commission), pursuant to Italian securities legislation and will not be subject to formal review by CONSOB. Accordingly, no Notes may be offered, sold or delivered, directly or indirectly nor may copies of this prospectus supplement or of any other document relating to the Notes be distributed in the Republic of Italy, except (a) to qualified investors (investitori qualificati) as referred to in Article 100 of the Italian Legislative Decree No. 58 of February 24, 1998, as amended (the “Italian Financial Act”), and as defined in Article 26, first paragraph, letter (d) of CONSOB Regulation No. 16190 of October 29, 2007, as amended (“Regulation 16190”), pursuant to Article 34 ter, first paragraph letter (b) of CONSOB Regulation No. 11971 of May 14, 1999, as amended (the “Issuer Regulation”), implementing Article 100 of the Italian Financial Act; and (b) in any other circumstances which are exempted from the rules on public offerings pursuant to Article 100 of the Italian Financial Act and the implementing CONSOB regulations, including the Issuer Regulation. Any such offer, sale or delivery of the Notes or distribution of copies of this prospectus supplement or any other document relating to the Notes in the Republic of Italy must be in compliance with the selling restrictions under (a) and (b) above and must be:

(i) made by soggetti abilitati (including investment firms, banks or financial intermediaries, as defined by Article 1, first paragraph, letter r), of the Italian Financial Act), to the extent duly authorized to engage in the placement and/or underwriting and/or purchase of financial instruments in the Republic of Italy in accordance with the relevant provisions of the Italian Financial Act, the Regulation 16190, as

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amended, Italian Legislative Decree No. 385 of September 1, 1993, as amended (the “Italian Banking Act”), the Issuer Regulation and any other applicable laws and regulations; and

(ii) in compliance with all relevant Italian securities, tax, exchange control and any other applicable laws and regulations and any other applicable requirement or limitation that may be imposed from time to time by CONSOB, the Bank of Italy or any other relevant Italian competent authorities.

Any investor purchasing the Notes is solely responsible for ensuring that any offer or resale of the Notes by such investor occurs in compliance with applicable laws and regulations.

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LEGAL MATTERS

The validity of the Notes is being passed upon for the Republic by Cleary Gottlieb Steen & Hamilton LLP, New York, New York, and by Bae, Kim & Lee LLC, Seoul, Korea. Certain legal matters will also be passed upon for the underwriters by Linklaters LLP, Seoul, Korea, and by Lee & Ko, Seoul, Korea. In giving their opinions, Cleary Gottlieb Steen & Hamilton LLP and Linklaters LLP may rely as to matters of Korean law upon the opinions of Bae, Kim & Lee LLC and Lee & Ko, and Bae, Kim & Lee LLC and Lee & Ko may rely as to matters of New York law upon the opinions of Cleary Gottlieb Steen & Hamilton LLP and Linklaters LLP.

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GENERAL INFORMATION

The issue of the Notes has been authorized by the National Assembly pursuant to a resolution adopted on December 8, 2018.

Other than as disclosed in this prospectus supplement and the accompanying prospectus, there has been no material adverse change in the financial position or affairs of the Republic since December 31, 2018 and the Republic is not a party in any litigation, arbitration or administrative proceeding that is material in the context of the issue of the Notes and is not aware of any such litigation, arbitration or administrative proceeding whether pending or threatened.

For so long as the Notes are listed on the Singapore Stock Exchange and the rules of the Singapore Stock Exchange so require, in the event any global notes are exchanged for certificated notes, the Republic will appoint and maintain a paying agent in Singapore, where the certificated notes may be presented or surrendered for payment or redemption. In addition, in the event any global notes are exchanged for certificated notes, an announcement of such exchange will be made by or on behalf of the Republic through the Singapore Stock Exchange. Such announcement will include all material information with respect to the delivery of the certificated notes, including details of the paying agent in Singapore. For so long as the Notes are listed on the Singapore Stock Exchange and the rules of the Singapore Stock Exchange so require, the Notes, if traded on the Singapore Stock Exchange, will be traded in a minimum board lot size of S$200,000 (or its equivalent in foreign currencies). Accordingly, the Notes, if traded on the Singapore Stock Exchange, will be traded in a minimum board lot size of US$200,000.

The registration statement with respect to the Republic and the Notes has been filed with the Securities and Exchange Commission in Washington, D.C. under the Securities Act. Additional information concerning the Republic and the Notes is contained in the registration statement and amendments to such registration statement, including their various exhibits, which may be inspected at the public reference facilities maintained by the Securities and Exchange Commission at Room 1024, 100 F Street N.E., Washington, D.C. 20549.

The Notes have been accepted for clearance through DTC, Euroclear and Clearstream:

	ISIN		CUSIP
2024 Notes		US50064FAR55		50064F AR5
2029 Notes		US50064FAQ72		50064F AQ7

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ISSUER

The Republic of Korea

Ministry of Economy and Finance

Sejong Government Complex

477Galmae-ro

Sejong-si 30109

The Republic of Korea

LEGAL ADVISERS TO THE REPUBLIC OF KOREA
as to matters of Korean law Bae, Kim & Lee LLC 133Teheran-ro,Gangnam-gu Seoul 06133 The Republic of Korea	as to matters of United States law Cleary Gottlieb Steen & Hamilton LLP c/o 19th Floor, Ferrum Tower 19Eulji-ro5-gil,Jung-gu Seoul 04539 The Republic of Korea
LEGAL ADVISERS TO THE UNDERWRITERS
as to matters of Korean law Lee & Ko Hanjin Building 63 Namdaemun-ro,Jung-gu Seoul 04532 The Republic of Korea	as to matters of United States law Linklaters LLP 22nd Floor, Center One Building 26,Eulji-ro5-gil,Jung-gu Seoul 04539 The Republic of Korea

FISCAL AGENT & PAYING AGENT

The Bank of New York Mellon

240 Greenwich Street

New York NY 10286

United States of America

SINGAPORE LISTING AGENT

Shook Lin & Bok LLP

1 Robinson Road

#18-00 AIA Tower

Singapore 048542