Jaein Chun is an attorney in Lee & Ko’s Criminal Defense Group. Before joining the firm in 2026, he served as a public prosecutor for 16 years, holding key positions in specialized investigative divisions of the Seoul Central District Prosecutors’ Office, Seoul Southern District Prosecutors’ Office, and Suwon District Prosecutors’ Office. His prosecutorial experience spans financial and securities crimes, anti-corruption and public-sector investigations, antitrust matters, virtual asset-related offenses, and industrial technology leakage.

During his prosecutorial career, Mr. Chun served in the Anti-Corruption Investigation Divisions and the Public Security Division of the Seoul Central District Prosecutors’ Office; the Defense Acquisition and Industrial Technology Crime Investigation Division of the Suwon District Prosecutors’ Office; and the Financial and Tax Crime Investigation Division of the Seoul Southern District Prosecutors’ Office. He was also served on secondment to the Financial Supervisory Service (FSS) initially as its inaugural Advisor for Investigations and Enforcement and subsequently as Legal Advisor. He concluded his prosecutorial career as Chief Prosecutor of Criminal Division I at the Mokpo Branch of the Gwangju District Prosecutors’ Office.

Mr. Chun has extensive experience in significant investigations involving violations of the Capital Markets Act by listed companies, stock price manipulation and the use of undisclosed material information, fraudulent trading involving virtual assets, bid rigging, bribery and abuse of authority, and the leakage of semiconductor and display technologies. During his secondment to the FSS, he advised on major financial crime investigations as well as criminal referrals and sanctions proceedings involving financial institutions. He further developed his regulatory expertise through his services on the FSS Sanctions Review Committee, the Securities and Futures Commission’s Capital Market Investigation Review Committee, and the Financial Services Commission’s Virtual Asset Market Investigation Review Committee.

Drawing on his extensive prosecutorial and regulatory experience, Mr. Chun advises and represents clients in corporate criminal matters involving finance, securities and capital markets, antitrust and competition, virtual assets, anti-corruption, and industrial technology and trade secret matters. He also assists clients in investigations, enforcement actions, sanctions proceedings, and other matters before financial and regulatory authorities.