Seoul Central District Prosecutors' Office Financial and Tax Investigation Division
• Spearheaded investigations into complex white-collar crimes, including stock price manipulation, fraudulent unfair trading, tax evasion, and issuance of false tax invoices.
• Led probes into corporate corruption cases, specifically focusing on embezzlement and breach of trust committed by executives of commercial banks and controlling families of large conglomerates.

Korea Deposit Insurance Corporation (KDIC) Financial Insolvency Investigation Headquarters
• Conducted extensive investigations into approximately 2,000 insolvent debtor corporations, successfully uncovering charges of embezzlement and breach of trust.
• Recovered approximately KRW 55 billion in loans based on investigation findings, significantly contributing to the preservation and recovery of public funds.

Seoul Central District Prosecutors' Office The 4th Special Investigation Division
• Investigated high-profile corporate crimes involving illegal credit extensions by major shareholders of listed companies.
• Uncovered and prosecuted cases of embezzlement, breach of trust, and tax evasion committed by owner families of Chaebols (large conglomerates).

As Head of Office and a Senior Executive Prosecutor, directed and supervised the entire lifecycle of criminal proceedings—from investigation to trial— major economic crimes, spanning general crimes, election law violations, national security cases, industrial accidents (Serious Accidents Punishment Act), and recruitment corruption.

Trinity Legal
• Defended numerous professionals from financial institutions in complex financial criminal cases.
• Represented corporate clients in cases involving violations of administrative regulations.
• Provided legal counsel and defense for C-levels in various criminal proceedings.