Criminal Affairs Specialist Yoon Jae-sung served as a police officer, holding various positions at the Seoul Metropolitan Police Agency and major police stations such as the Seoul Seocho and Songpa Police Stations, including Team Leader of the 112 Emergency Call Center, Team Leader of the Traffic Safety Team, Head of the Investigation Division, and Head of a Police Substation. Based on his extensive field experience and practical investigative skills, he has built expertise in the fields of criminal law, traffic, and public safety. Currently, he serves as a Criminal Affairs Specialist at Sanwoo Law Firm (LLC), providing in-depth advice and practical support for criminal cases.