A by-the-book police officer is assigned to secretly investigate a team leader who believes that the rules shouldn't stop an investigation. As the officer investigates further, his own attitudes begin to mirror the team leader's.
The Policeman's Lineage is a 2022 South Korean action thriller film, directed by Lee Kyoo-man and starring Cho Jin-woong and Choi Woo-shik. The film, based on Japanese novel Blood of the Policeman by Joh Sasaki, is about two cops with different methods forming a team to investigate a case that turns the police force upside down. The film was released theatrically on January 5, 2022.