About

Provided by Yoon & Yang LLC

Drawing on the experience and expertise of over 50 specialists in antitrust and competition issues, Yoon & Yang’s Antitrust & Competition Practice provides clients with advanced guidance across all aspects of Korean antitrust and competition laws. These include the Monopoly Regulation and Fair Trade Act, the Fair Transactions in Subcontracting Act, the Act on the Regulation of Terms and Conditions, the Act on Fair Labeling and Advertising, the Fair Transactions in Franchise Business Act, the Act on Fair Transactions in Large Retail Business, the Act on Door-to-Door Sales, the Act on Consumer Protection in Electronic Commerce, the Installment Transactions Act and the Fair Agency Transactions Act. The Practice offers one-stop services covering regulatory, litigation and investigation matters.

As a long-standing advisor that excels in antitrust and competition issues faced by multinational and major domestic companies, Yoon & Yang’s Antitrust & Competition Practice has earned strong domestic and global recognition. It has been selected as an Elite Law Firm in competition law for 17 consecutive years, from 2009 to 2025, by Global Competition Review (GCR).

The Practice also works closely with experts across the firm’s other practices—including intellectual property, finance, corporate and tax—to deliver integrated services tailored to diverse industries. It has played a central role in key antitrust matters, particularly in the IT, finance, logistics and platform sectors.

Chambers Review

Provided by Chambers

Competition/Antitrust - South Korea

2
Band 2

What the Team is Known For

Yoon & Yang fields a team of fair trade specialists well equipped to defend against claims of unfair business practices. The team is routinely instructed in relation to significant antitrust rulings and market dominance cases. It has experience in handling merger clearance matters in connection with both domestic and cross-border M&A transactions and joint ventures, and is well versed in representing clients in KFTC investigations. The practice regularly advises both domestic and international corporations from the TMT, steel, construction, engineering and aviation industries.

Work Highlights

  • Yoon & Yang represented Hyundai Steel in the criminal proceedings initiated by the KFTC securing a verdict of acquittal and case dismissal, in an investigation into alleged price fixing.

Strengths

Provided by Chambers

Notable Practitioners

Provided by Chambers

Hoil Yoon
S
Hoil Yoon
S
Senior Statespeople

Yoon Hoil is highly respected for his contribution to the development of the competition and antitrust practice in South Korea. He has extensive experience in handling high-profile investigations, often brought before the KFTC.

Chul Ho Kim
2
Chul Ho Kim
2
Band 2

Kim Chul Ho routinely represents high-profile multinationals and domestic corporations operating in the steel, electronics and life sciences industries in cartel investigations as well as cases concerning false advertising and unfair trade practices.

Kim Chul Ho has a high level of understanding of customers' requests.

We are very satisfied with the quick and professional advice based on a high level of understanding of technical issues that are difficult to understand unless you are in the industry.

Keum Seok Oh
2
Keum Seok Oh
2
Band 2

Oh Keum Seok maintains an active practice handling contentious antitrust cases for major domestic corporations and international companies and financial institutions. He has notable expertise in a wide range of issues, encompassing abuse of dominant position and abuse of bargaining power cases, bid rigging and price manipulation investigations.

Paul S. Rhee
4
Paul S. Rhee
4
Band 4
Paul Rhee maintains an active contentious and litigious antitrust practice. He advises clients on merger clearances and handles the competition law aspects of joint ventures, in addition to representing parties in damages lawsuits brought in relation to cartel activity. He typically acts for US-based corporations.
Sang Oh Jeon
4
Sang Oh Jeon
Head of Competition/Antitrust
4
Band 4

Jeon Sang Oh heads Yoon & Yang's competition and antitrust practice. He advises on KFTC investigation and review cases, and is regularly instructed by Korean entities in the steel, shipping, retail and internet sectors.

Jeon Sang Oh provides appropriate advice to clients based on his diverse experience in the field of fair trade.

Jeon Sang Oh presents realistic and feasible alternatives and suggests the best solution from the customer's interest.

Ranked Lawyers at
Yoon & Yang LLC

Provided by Chambers
Filter by
Band

South Korea

Competition/Antitrust

Hoil Yoon
S
Hoil Yoon
S
Senior Statespeople
Chul Ho Kim
2
Chul Ho Kim
2
Band 2
Keum Seok Oh
2
Keum Seok Oh
2
Band 2
Paul S. Rhee
4
Paul S. Rhee
4
Band 4
Sang Oh Jeon
4
Sang Oh Jeon
Head of Competition/Antitrust
4
Band 4

Members

Provided by Yoon & Yang LLC

Chang-Mo An

SB(Suakbuam) Hong

Sang Oh Jeon

Sang Oh Jeon

Head of Department

Young Min Kang

Clients

Provided by Yoon & Yang LLC

BYC Co., Ltd.

British America Tobacco Korea

HLB Therapeutics

Hanwha

Hyundai Group

Hyundai Motor Group

Hyundai Steel

IBK (Industrial Bank of Korea)

Kakao

Korea Music Copyright Association

Korean Air

LG Group

LS ELECTRIC Co., Ltd.

Microsoft

Ottogi Corporation

Qualcomm

SK Group

Samsung Group

TR Beltrack

Wesang LLC