Prior to joining Lee & Ko's Criminal Defense (Investigations) Team, Kapjin Choi worked for 8 years as a public prosecutor after 5 years of public service as a police officer in Incheon Metropolitan Police Agency. As a prosecutor, he worked at Seoul Central District Prosecutors' Office, Seoul Eastern District Prosecutors' Office, Ulsan District Prosecutors' office and Chungju Branch of the Cheongju District Prosecutors' Office.

Having great experience at various law enforcement offices, Mr. Choi's practice at Lee & Ko focuses on criminal cases related to anti-corruption, intellectual property, large-scale disasters and the environment.