Firm / Organisation

Yoon & Yang LLC

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This content is provided by Yoon & Yang LLC.

Managing Partners: Jinsu Jeong; Junsang Lee; Myung Soo Lee
Number of partners: 111
Number of lawyers: 340
Languages: Chinese, English, German, Japanese, Korean, Russian, Vietnamese, Spanish

Firm Overview:
Since its establishment in 1989, Yoon & Yang LLC has been one of Korea’s premier full-service law firms, providing comprehensive legal solutions to clients around the world in all areas of legal practice. Recently, the firm opened two offices in Vietnam, in addition to its Tashkent office in Uzbekistan. The two new openings enhanced its strong strategic presence in Southeast Asia. The firm now has over 400 professionals with diverse expertise providing one-stop solutions include both legal advice and practical solutions. The firm has a strong client base including large Korean corporations as well as numerous multinational businesses. 

Practice Areas
Antitrust & Competition
Admiralty & Maritime
Banking, Securities & Finance
Capital Markets
Defence Procurement
Government Relations
Health Care
Intellectual Property
International Trade & Investment
Litigation & Arbitration
Privacy & Data Protection & Internet
Real Estate & Construction
Tax & Customs
White Collar Criminal Defence

Main Areas of Practice:

Antitrust & Competition:
■ Currently representing Qualcomm as the primary counsel in an administrative lawsuit before the Seoul High Court. Qualcomm is seeking the annulment of the KFTC’s corrective order and an administrative surcharge in the amount of KRW 1,030,000,000,000 (approximately USD$865 million) for alleged abuse of dominance involving Qualcomm’s patent licensing practices
■ Successfully represented Performance Optics and its subsidiaries (Vision Ease in the USA and Daemyung Optical in Korea) in the KFTC’s merger review investigations into its sale to Japan-based HOYA Corporation
Contact: Seong Sig Kim
Email: [email protected]

Banking Regulation:
■ Successfully advised Shinhan Bank in its acquisition of Indonesia’s Bank Metro Express (BME) and Centratama Nasional Bank (CNB) and the subsequent mergers
■ Successfully represented major Korean banks against regulatory sanctions on the violation of CDD (Customer Due Diligence) and CTR (Currency Transaction Report) obligations
Contact: Soonghee Lee
Email: [email protected]

Employment & Labour:
■ Successfully represented Hyundai Motor Company in lawsuits filed by HMC’s employees seeking for wages for overtime work on a holiday
■ Successfully represented Hyundai Motor Company in lawsuits initiated by HMC’s fixed-term employees claiming wrongful termination based on the right to renewal of employment contracts
Contact: Sang Hoon Park
Email: [email protected]

Intellectual Property:
■ Representing Merck, Sharp & Dohme Corp. in actions challenging the validity of Pfizer’s patents directed to pneumococcal conjugate vaccines
■ Advising Qualcomm Corporation on complicated IP issues, including SEP licensing and patent exhaustion, in connection with KFTC’s corrective order against Qualcomm’s cellular-SEP licensing practices
Contact: Wonil Kim
Email: [email protected]

Litigation/Dispute Resolution:
■ Successfully represented Hanwha Chemical in a lawsuit against Korea Development Bank (KDB). Yoon & Yang LLC successfully argued for the inappropriateness of the MOU cancellation and confiscation of the performance bond in Hanwha Chemical’s attempted acquisition of DSME
■ Currently representing KEB Hana Bank and NH NongHyup Bank, two creditor banks, in litigations seeking the repayment of a loan in the amount of KRW 160 billion executed on the grounds of fraudulent provision of collaterals
Contact: Seung Ryong Yoo
Email: [email protected]

■ Successfully advised Hugel, a KOSDAQ-listed Korean botox manufacturing company, in the sale of its shares to Bain Capital for KRW 927.4 billion
■ Advised CHA Healthcare in its acquisition of City Fertility Centre, a renowned fertility centre in Australia
Contact: Sung-Jin Kim
Email: [email protected]

■ Successfully represented Booyoung, a real estate conglomerate, in its challenge against the tax authority’s imposition of corporate tax of KRW 14 billion under the business purpose real property theory
■ Successfully represented Longchamp Korea in challenging all of the customs duty in the amount of KRW 3.4 billion in connection with imported handbags and accessories
Contact: Oh-Young Jeon
Email: [email protected]

International Arbitration:
■ Successfully represented General Electric against a Korean insurance company in a KCAB international arbitration case regarding an alleged insurance subrogation claim
■ Representing POSCO ICT, one of the major energy and environmental solutions companies in Korea, against a Chinese import and export company in a SIAC arbitration case over payment obligations
Contact: Junsang Lee
Email: [email protected]

International Trade:
■ Assisted a Korean automobile conglomerate in its actions against the US federal government in its claim that exports of automobiles and auto parts do not pose any threat to the U.S. national security in regards to the US Section 232 investigation
■ Successfully represented Korean PET film manufacturers in an anti-dumping duty petition with respect to imported PET films from Taiwan and UAE
Contact: Sungbum Lee
Email: [email protected]

White Collar Crime:
■ Successfully defended the director of the Eastern District of Gwangju Metropolitan City who had been indicted for receiving bribes in the amount of KRW 15 million
■ Successfully defended a former CEO of POSCO ChemTech who had been indicted for the provision of bribes to a former National Assembly member
Contact: Ohsung Kwon
Email: [email protected]


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