EXHIBIT 12.1

                    CERTIFICATION OF CHIEF EXECUTIVE OFFICER
            PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

     I, Young Bae Ku, certify that:


1.   I have reviewed this annual report on Form 20-F/A of Gmarket Inc. (the
     "Company");

2.   Based on my knowledge, this report does not contain any untrue statement of
     a material fact or omit to state a material fact necessary in order to make
     the statements made, in light of the circumstances under which such
     statements were made, not misleading with respect to the period covered by
     this report;

3.   Based on my knowledge, the financial statements, and other financial
     information included in this report, fairly present in all material
     respects the financial condition, results of operations and cash flows of
     the Company as of, and for, the periods presented in this report;

4.   The Company's other certifying officer and I are responsible for
     establishing and maintaining disclosure controls and procedures (as defined
     in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over
     financial reporting (as defined in Exchange Act Rules 13a-15(f) and
     15d-15(f)) for the Company and have:

(a)  designed such disclosure controls and procedures or caused such disclosure
     controls and procedures to be designed under our supervision, to ensure
     that material information relating to the Company, including its
     consolidated subsidiaries, is made known to us by others within those
     entities, particularly during the period in which this report is being
     prepared;

(b)  designed such internal control over financial reporting, or caused such
     internal control over financial reporting to be designed under our
     supervision, to provide reasonable assurance regarding the reliability of
     financial reporting and the preparation of financial statements for
     external purposes in accordance with generally accepted accounting
     principles;

(c)  evaluated the effectiveness of the Company's disclosure controls and
     procedures and presented in this report our conclusions about the
     effectiveness of the disclosure controls and procedures, as of the end of
     the period covered by this report based on such evaluations; and

(d)  disclosed in this report any change in the Company's internal control over
     financial reporting that occurred during the period covered by the annual
     report that has materially affected, or is reasonably likely to materially
     affect, the Company's internal control over financial reporting; and

5.   The Company's other certifying officer and I have disclosed, based on our
     most recent evaluation of internal control over financial reporting, to the
     Company's auditors and the audit and finance committee of the Company's
     board of directors (or persons performing the equivalent functions):

(a)  all significant deficiencies and material weaknesses in the design or
     operation of internal control over financial reporting which are reasonably
     likely to adversely affect the Company's ability to record, process,
     summarize and report financial information; and

(b)  any fraud, whether or not material, that involves management or other
     employees who have a significant role in the Company's internal control
     over financial reporting.


Date: June 8, 2007


                                          /s/ Young Bae Ku
                                          --------------------------------------
                                          Young Bae Ku
                                          Chief Executive Officer