Gi Ok Lee Partner
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  • TEL 82 2 6003 7586
  • FAX 82 2 6003 7021
  • E-MAIL
Ki Ok Lee is a partner at Yoon & Yang LLC. His practice focuses on criminal defense related to tax, finance, intellectual property, and food and safety issues.
Mr. Lee has extensive experience in investigations relating to public official corruption, corporate and financial crimes such as embezzlement and breach of trust, as well as tax, environment, and food issues from his career as a prosecutor and chief prosecutor at the Seoul Northern District Public Prosecutors' Office, Ulsan District Public Prosecutors' Office, Suwon District Public Prosecutors' Office, Seoul Central District Public Prosecutors' Office, Daegu District Public Prosecutors' Office, Suwon District Public Prosecutors' Office Pyeongtaek Office and Ansan Branch Office. In particular, Mr. Lee achieved outstanding results in the field of environment and food crimes while serving as an environment and food inspector at the Ulsan District Public Prosecutors' Office and Suwon District Public Prosecutors' Office. He has expertise in the collection and management of criminal information based on his experience as a prosecutor research officer in the Office of the Supreme Prosecutor's Office.


  • 2016-present Yoon & Yang LLC
  • 2023-present Honorary Legal Advisor, National Water Industry Cluster Project Group, Korea Environment Corporation
  • 2018-present Legal Advisor for Public Officials Handling Complaints, Government Employees Pension Service (for public officials handling complaints)
  • 2015-16 Chief Prosecutor, Ansan Branch, Suwon District Public Prosecutors’ Office
  • 2014-15 Chief Prosecutor, Criminal 4th Division, Daegu District Public Prosecutors’ Office
  • 2012-14 Chief Prosecutor, Pyeongtaek Branch, Suwon District Public Prosecutors’ Office
  • 2011-12 Prosecution Research Officer, Supreme Prosecutors’ Office
  • 2009-11 Prosecutor, Cheongju District Public Prosecutors’ Office
  • 2006-09 Prosecutor, Seoul Central District Public Prosecutors’ Office
  • 2004-06 Prosecutor, Suwon District Public Prosecutosrs’ Office
  • 2002-04 Prosecutor, Ulsan District Public Prosecutors’ Office
  • 2001-02 Prosecutor, Seosan Branch of Daejeon District Public Prosecutors’ Office
  • 1999-01 Prosecutor, Northern Branch of Seoul District Public Prosecutors’ Office


  • 2001 Yonsei University School of Law, LL.B.
  • 1999 Judicial Research and Training Institute

Representative Matters

  • Represented executives and employees of large corporations including Company D, Company S, and Company I on charges of embezzlement and breach of trust
  • Represented Company B and Company S on tax related charges
  • Represented Company D and Company I on charges related to market manipulation
  • Represented client in charges relating to unfair employment in the Financial Supervisory Service and Company K
  • Represented Company H, Company C, and Company K on charges relating to unlawful food and the environment
  • Represented pharmaceutical companies, doctors, and pharmacists in charges related to drug rebates


  • Ministerial Commendation, Ministry of Justice (2016)
  • Prosecutor General Commendation (2002)


  • “A Study on the Audit of the Standard to Determine the Tax Base for the Customs Valuation of Ex Post Compensation Adjustments for Multinational Corporations,” Public Audit and Inspection Review No. 37 (co-author), 2021.