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Lee & Ko

Work +82 2 772 4000
Fax +82 2 772 4001
Seoul, Seoul

Yeonsoo Yun

Work +82-2-6386-6360
Lee & Ko

Work Department

M&A, IP, TMT (technology, media & telecommunications)




Attorney (Partner), Lee & Ko: 2017-Present
Professor of Law, KAIST: 2011-2017
Arbitrator, The Korean Commercial Arbitration Board: 2003-Present
Attorney (Partner), Shin & Kim: 1999-2011
Prosecutor, Seoul District Prosecutors' Office: 1995


Korean, English, Japanese


Korea (1992)
State of New York, US (1999)


Washington University, School of Law, LL.M (Comparative Law): 1999
Judicial Research & Training Institute, Supreme Court of Korea: 1992
Seoul National University, Graduate School of Law (Tax): 1989
Seoul National University, School of Law (Private Law): 1986

South Korea

International arbitration

Within: International arbitration

Lee & Ko has strengthened its international arbitration practice with the recruitment of Hyunsoo Joo from Kim & Chang, Charles Peterson from Pillsbury Winthrop Shaw Pittman LLP and distinguished law professor Yeonsoo Yun. The ‘value for money’ team is lauded for ‘approaching the core of the problem quickly and accurately’ with expertise in construction, shipping and life sciences disputes. Robert Wachter and Jae Hwan Kim are defending an insurer in a complex dispute arising from retubing work at a nuclear power plant. The team is also instructed in several highly technical cross-border disputes concerning construction and engineering projects and military procurement. Sungwoo Lim knows ‘how to lead and advise the clients to get to the goal’, David Kim is noted for his ‘great advocacy skills and strong logic’, while Hyunyang Koo has ‘great communication and investigation skills’. Sunyoung Kim focuses on corporate transactions and regularly acts alongside Wachter.

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South Korea: Regulatory: compliance and investigations

Regulatory: compliance and investigations – Local firms

Within: Regulatory: compliance and investigations – Local firms

As ‘one of the top law firms’, Lee & Ko attracts praise for its wide-ranging expertise in compliance and white-collar criminal investigations, as well as for its ‘immediate and value-added advice’. The practice also maintains a digital forensic team, ensuring client confidentiality and a quick turnaround of results – an aspect very much valued by its clients. Taek Rim Oh is ‘one of the best cross-border attorneys in Korea’, according to one client. Tae-Ki Ghil, Chan-Youp Song, Jae-Deog Bae and Joon Kim advised McDonald's in relation to criminal complaints filed by consumers claiming to have contracted hemolytic-uremic syndrome from hamburgers. Yong-Seok Park, Song and Tae Yop Lee are defending Samsung Display against a criminal complaint brought by LG Display over alleged trade secret misappropriation. Other names to note are Jin So, Sedong Min, Yeonsoo Yun and Yuseok Kim.

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