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SANG OH JEON / Partner



Sang Oh Jeon is a partner at Yoon & Yang LLC and his practice focuses on antitrust and fair trade laws (including subcontracting law and franchise business law, etc.), international contracts, corporate consulting services, and international litigation. He specializes in advice on the Korea Fair Trade Commission’s investigations regarding various cartel cases; unfair trade practice cases; violation of subcontracting law; violation of franchise business law. And, his experience covers claims for damages for violation of antitrust law and administrative litigations against dispositions of the Korea Fair Trade Commission. He also has represented foreign companies in their international lawsuits; domestic and overseas companies regarding international contracts and general corporate matters; and various franchise headquarters regarding litigations and legal matters. And, he has provided compliance training for major domestic and foreign companies.


University of Southern California Gould School of Law, LL.M.
Hanyang University, Graduate School in International Trade Law
Seoul National University, B.A. in Psychology


Partner, Yoon & Yang LLC (formerly Yoon Yang Kim Shin & Yu, 2006-2009)
Legal Advisor and Director, Korean Federation of Middle & High School Athletic Associations
Lecturer, Korea Productivity Center
Yonsei University, Franchise Business Course
Lecturer, Fair Competition Federation
Seoul National University, School of Law, Fair Trade Expert Course
Associate, Yoon & Yang LLC
Public Attorney, Ministry of Justice


  1. “Half Price Commission and Antitrust Law, Competition and Law, Legal Times, April 2015
  2. “GCR Know how - Immunity, Sanction & Settlements(Korea),” Global Competition Review (co-author), 2015
  3. “Applicable Laws and Calculation of Relevant Sales in Bid Rigging Cases,” The 9th Economic Law Case Study, Academy of Economic Law Case Study (co-author), 2015

Representative Matters

  • Represented an airline in the Korea Fair Trade Commission’s investigation on collusive acts regarding oil surcharges and in subsequent administrative lawsuits  
  • Represented construction companies in the Korea Fair Trade Commission’s investigations on collusive acts regarding the Honam High Speed Railway, the Gyeongin Canal, the Daegu subway, and the Busan subway and in subsequent administrative lawsuits
  • Represented an electric appliance manufacturer in the Korea Fair Trade Commission’s investigation on collusive acts regarding home appliances  
  • Represented an elevator manufacturer in a claim for damages for elevator manufaturers’ bid-rigging
  • Represented an autopart manufacturer in the Korea Fair Trade Commission’s investigation on autopart manufacturers’ bid-rigging 
  • Represented a client in the Korea Fair Trade Commission’s investigation on the unfair trade practices of mobile phone service providers and mobile phone manufacturers and in the relevant claim for damages 
  • Represented a client in the Korea Fair Trade Commission’s investigation on the fixing of LIBOR and other rates



Practice Area

Recent MattersMore


  • 2005 Korea


  • Korean and English

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