Ok-Sook Byun

Practice Areas

Ms. Ok-sook Byeon is currently a partner at Shin & Kim, and her main areas of work are investigation response and court-level pleadings and advice on corporate-related criminal cases such as fair trade, environment, trade secrets, medical, finance, and taxation.

Based on her experience at the Prosecutor’s Office, she has achieved outstanding results in many major corporate management-related cases such as embezzlement and misappropriation, fair trade, environment, finance, taxation (tariffs), trade secrets, white-collar crimes, medical pharmaceuticals, response to investigation agencies in the field of serious accidents, and court-level arguments, and has experience in providing various advice on criminal issues arising in the corporate management process. She also demonstrates outstanding expertise in compliance and internal investigations.

In 2020, 2021, and 2022, she was named the “Best Lawyer” by Hankyung Business for three consecutive years, and in 2023, she was named the “Best Lawyer in White-Collar Crime” by JoongAng Ilbo. She won awards including the 2024, 2025 Benchmark “Asia’s Top 100 Litigation Women Lawyers”, and 2025 Chambers Asia, Dispute Resolution: “Leading Individual” in the White-Collar Crime sector.

Career

Member, Public Officials’ Accident Compensation Pension Committee (2025-Present)

Member, Korea Coast Guard Commission (2023-Present)

Legal Counsel, Industrial safety, Korea Electric Power Corporation (2022-Present)

Governmental Member of the Patriots and Veterans Entitlement Commission, Ministry of Patriots and Veterans Affairs (2021-Present)

Advisory Member, National Health Insurance Corporation (2010-Present)

Shin & Kim LLC (2010-Present)

Public Prosecutor, Daejeon District Public Prosecutors' Office (2009-2010)

Public Prosecutor, Goyang Branch of the Uijeongbu District Public Prosecutors' Office (2006-2009)

Public Prosecutor, Suwon District Public Prosecutors' Office (2004-2006)

Public Prosecutor, Ulsan District Public Prosecutors' Office (2002-2004)

Judicial Research & Training Institute of the Supreme Court of Korea (2000-2002)

Professional Memberships

Korean Bar

Publications

Study on Proving Methods for the Establishment of Truthfulness of Evidence and the Value of Evidence under the Spanish Evidence Law (Collection of Thesis, 2009, Legal Research &Training Institute)

Work Highlights

Embezzlement, misappropriation, tax, and accounting fraud cases involving executives and employees of large bio companies, securities companies, major distribution companies, IT companies, and large hospital groups.

Violation of the Capital Markets Act by executives and employees of large corporations and major financial institutions

Insider trading and stock price manipulation by large corporations

Defense business and military secret cases of large corporations

Environment-related cases by large corporations

Violations of the Fair Trade Act by large construction companies, large confectionery companies, and pharmaceutical companies, and bid rigging cases.

Cases regarding business secrets and personal information related to large companies, pharmaceutical companies and broadcasting companies

Customs and foreign exchange cases involving large corporations, major financial companies, and foreign companies.

Violations of the Public Official Election Act by National Assembly members, high-ranking public officials, and local government heads, etc.

Rebates by global pharmaceutical companies

Violation of the Medical Service Act and the Pharmaceutical Affairs Act by hospitals, clinics, pharmacies, etc., and unfair claims for insurance benefits

Internal investigations by large corporations, financial companies, etc., consultation on compliance

Response to and consultation on entertainment and celebrity investigations

Education