He started working in editing department of 2005 film Welcome to Dongmakgol.
He edited films with directors Bong Joon-ho (Snowpiercer (2013)), Kim Seong-hun (A Hard Day (2014) and Tunnel (2016)), Park Hee-gon (Fengshui), Park Hoon-jung (V.I.P.
[1] As of May 2022, Kim has edited more than 60 films and 2 TV series Athena: Goddess of War (2010), Kingdom (2019–20).
[2] Kim made his directorial debut in 2021 thriller film Hard Hit.
[3] He has won Grand Bell Awards and Blue Dragon Film Awards for Best Editing for films Snowpiercer (2013) and A Hard Day (2014) respectively.