In July 2016, Hyundai Merchant Marine executed a debt-to-equity swap with us and other creditors, as part of its continued restructuring led by us as its largest creditor, and affiliates of the Hyundai group reduced their shareholdings in Hyundai Merchant Marine, which resulted in us becoming the largest shareholder of Hyundai Merchant Marine. In October 2018, we injectedW1 trillion in emergency aid into Hyundai Merchant Marine in order to normalize its operations by purchasing bonds with warrants and convertible bonds issued by Hyundai Merchant Marine. Subsequently, in April 2020, Hyundai Merchant Marine issued perpetual bonds amounting toW720 billion, which we and Korea Ocean Business Corporation each purchased in equal amounts. As of June 30, 2020, our equity interest in Hyundai Merchant Marine amounted to 12.9%.
In January 2019, Hanjin Heavy Industries and Construction Philippines, a subsidiary of Hanjin Heavy Industries and Construction at Subic Bay in the Philippines, declared bankruptcy and filed for corporate rehabilitation with a regional trial court following its failure to comply with loan obligations to its Philippine lenders. In March 2019, creditors in Korea (including us) and lenders in the Philippines agreed on, and executed, a business normalization plan including a debt-to-equity swap and capital reduction for Hanjin Heavy Industries and Construction, as a result of which we have become the largest shareholder of Hanjin Heavy Industries and Construction.
STX Offshore & Shipbuilding has faced financial difficulties for the past several years due to prolonged slowdowns in the Korean shipbuilding and shipping industries. STX Offshore & Shipbuilding, which had filed for court receivership in May 2016 and executed debt-to-equity swaps with their creditors (including us) in December 2016 under a rehabilitation plan through which we increased our equity interest to 43.9% and became its largest shareholder, exited court receivership in July 2017. As of June 30, 2020, our exposure to STX Offshore & Shipbuilding was classified as expected loss.
Dongbu Steel has also been facing financial difficulties for the past several years due to the prolonged slowdown in the Korean construction industry and in the Korean economy in general. Dongbu Steel entered into a voluntary workout agreement with its creditors, including us, in October 2015. Such agreement expired in September 2019 when KG Steel, a subsidiary of KG Group established in May 2019, became the largest shareholder of Dongbu Steel, which was subsequently re-named to KG Dongbu Steel. All of KG Dongbu Steel’s outstanding debt to its creditors, including us, is currently scheduled to mature at the end of 2025.
Doosan Heavy Industries & Construction Co., Ltd. has also faced financial difficulties due to the prolonged slowdown in the Korean heavy and construction industries and in the Korean economy in general, as well as the Government’s initiative to support clean and renewable energy sources while phasing out nuclear and coal-fired plants in recent years. Doosan Heavy Industries submitted a self-rescue plan to its creditors, including us, and we provided Doosan Heavy Industries with loans amounting toW500 billion,W400 billion andW600 billion in March, April and June 2020, respectively.
In the first half of 2020, we sold non-performing loans worthW243.2 billion to Hana F&I.
Our large exposure to financially troubled companies in Korea means that we are also exposed to financial difficulties experienced by our borrowers as a result of, among other things, adverse economic conditions in Korea and globally, which could disrupt the business, activities and operations of many of our borrowers, which in turn could have an adverse impact on the ability of our borrowers to meet existing payment or other obligations to us. The COVID-19 pandemic has had an especially direct negative impact on certain of our borrowers, among them the airline industry, which has been in significant need of liquidity following a sharp decline in aircraft traffic and a dramatic increase in the number of suspended flights due to entry restrictions imposed by many countries in response to COVID-19 in recent months.
As of June 30, 2020, our exposure (including loans classified as substandard or below and equity investment classified as estimated loss or below) to Korean Air Co., Ltd., a subsidiary of Hanjin Group and Korea’s largest airline and flagship carrier, amounted toW1,884.0 billion, an increase fromW1,401.3 billion as of December 31,
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