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Asia-Pacific 2022
South Korea Intellectual Property
Band 3

1 Ranked Lawyers


Provided by Yoon & Yang LLC

Yoon & Yang’s IP Practice Group handles a wide range of matters relating to patents, trade secrets, copyright and trademark disputes and prosecution. Work flows from all of IP areas are increasingly consistent between 2020 and 2021.

The Practice Group houses also prominent attorneys including Wonil Kim, Dongju Kwon, all of whom are senior partners at the Group. The two senior partners are well reputed by the clients for their active involvement in patents (Wonil Kim, Dongju Kwon) and trade secret (Wonil Kim) matters.

For junior partners, it is noteworthy to highlight Keun Woo Lee, Sejung Lee and Chang Woo Lee. Keun Woo involves in firm’s most high profile trade secret and copyrights litigations. Keun Woo also retains three major broadcasting companies in his clientele. Sejung Lee and Chang Woo Lee are both experts in patent and trade secret issues. Sejung, who was successfully chosen as a 40 Under 40 in Asia by Asian Legal Business currently handles SK Innovation-LG Chem’s trade secret dispute and Qualcomm’s patent related litigation in South Korea, both cases are one of the high profiles cases in Korean IP markets.

For industry perspective, Yoon & Yang strongly holds its position in IT powerhouse for IP matters, The firm retains Qualcomm, SK Innovation as its long time clients and this trends still continue in 2021.

Chambers Review

Provided by Chambers
Intellectual Property - South Korea
Band 3
What the team is known for

Yoon & Yang has a well-rounded practice recommended for its litigation abilities, especially in the IT and media sectors. Services a domestic and multinational client base in respect of patent and trade mark infringement disputes. Frequently instructed on cross-border IP litigation and also experienced in handling cases involving issues of competition law. Its current client roster includes media and pharmaceutical companies as well as international IT companies, consumer goods producers and luxury brand owners, such as Korea Broadcasting System (KBS), Munhwa Broadcasting Corporation (MBC), Microsoft and Kolon Life Science. Handles mandates concerning trade secrets misappropriation and data protection. Also well regarded for its work on copyright infringement cases.


A client praises its bench depth and breadth of expertise, saying: "I think Yoon & Yang’s IP team has strong manpower as they have patent attorneys, experienced attorneys and even attorneys who are also licensed pharmacists. They have capabilities to cover all areas of IP-related cases including patent and trade mark prosecution, litigation and regulations. In addition, I am impressed that attorneys regardless of their level, both partners and associates, provide us with innovative legal solutions which are analysed from multiple angles."

A second commentator adds: "I like their responsiveness generally, and their advice has been clear and effective."

Work highlights

Represented SK Chemicals in a patent infringement case initiated by Novartis. Novartis claimed SK Chemicals infringed its Exelon Patch-related patent.

Notable practitioners

Wonil Kim heads Yoon & Yang's IP practice group. He has particular expertise advising on patent infringement and invalidation proceedings. He continues to serve a host of domestic and foreign clients in the pharmaceutical and technology sectors.

Ranked Lawyers at
Yoon & Yang LLC

Provided by Chambers
Filter by

South Korea

Intellectual Property

Wonil Kim
Wonil Kim
Band 4


Provided by Yoon & Yang LLC

Chang Woo Lee

Dongju Kwon

Keun Woo Lee

Sejung Lee

Member photo

Wonil Kim

Head of Department


Provided by Yoon & Yang LLC

HITE Jinro

Hanmi Pharm

Hanwha Compound

Kolon Life Science

Kumho Petro Chemical Co., Ltd.


Merck Sharp & Dohme Corp.


SK Chemicals

SK Innovation

SK Shipping

SK bioscience

SK hynix, Inc.

SPC Group

ST Unitas

STX Engine

Siemens AG