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Yu-Seog Won

Work +82 2-3703-1869
Kim & Chang

Work Department

Litigation, Intellectual Property, Corporate Investigations & White Collar Defense, IP & Technology Transactions, IP Litigation, Banking, Securities & Finance Litigation, Intellectual Property Litigation, Trade Secret Litigation, Trade Secret & Corporate Information Protection


Yu-Seog Won is an attorney at Kim & Chang’s Litigation and Intellectual Property Practices. Mr. Won worked at the Patent Court for multiple years and is experienced in advising clients on a variety of patent cases.

Before joining Kim & Chang, Mr. Won served in the judiciary for almost two decades, first as a judge in district courts, and later as a presiding judge in the Patent Court and the Seoul High Court. During his tenure as a judge, he accumulated extensive experience in a wide range of civil, patent, trademark and design litigation.

Reflecting his varied experience as a judge, Mr. Won practices in a broad range of patent litigation at the firm. In his civil litigation practice, he specializes in intellectual property. He also has considerable experience in giving legal advice to junior attorneys when he served as a professor at the Judicial Research and Training Institute.


Korean, English and Japanese (reading only)


Admitted to bar, Korea, 1985


University of Washington School of Law (LL.M., 1995)
Judicial Research and Training Institute of the Supreme Court of Korea (1985)
College of Law, Seoul National University (LL.B., 1984)

South Korea: Intellectual property

Intellectual property – Local firms

Within: Intellectual property – Local firms

Jay Young-June Yang leads Kim & Chang’s substantial and prominent IP practice, which remains the ‘top-choice’ for international pharmaceutical companies and international brands; the practice is well known for its strength in litigation and in a recent landmark case, Bo Hyun Park and Duck Soon Chang successfully defended Astellas Pharma against challenges to the patent term extension, the first Korean case in which the court issued specific guidance regarding the proper calculation method for determining the PTE term. Young Kim has an impressive track record in pharmaceutical patent litigation; she and Yu-Seog Won have defended one of Pfizer’s top-selling drugs, Lyrica, in various patent actions against generic companies. Sang-Wook Han is experienced in advising Japanese clients. For trade mark and design matters, Sung-Nam Kim, Ann Nam-Yeon Kwon, Angela Kim and John J Kim all have substantial experience in prosecution, enforcement and portfolio management. In patent litigation, Jong Seok Kim, Bong Seop Kim and Kum Uk Lee successfully represented AT Solutions in invalidating the patents of a competitor.

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