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 Benchmark “Asia’s Top 100 Litigation Women Lawyers”, and 2025 Chambers Asia, Dispute Resolution: “Leading Individual” in the White-Collar Crime sector.

• 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