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.
Park Kang-yoon
Cho Jin-woong
Choi Min-jae
Choi Woo-shik
Chief of inspection
Park Hee-soon
Na Young-bin
Kwon Yul
Cha Dong-chul
Park Myung-hoon
President Kim
Jeong Seong-mo
Seo Joong-ho
Lee Eol
Yong
Hong Gi-jun
Kim
Lee Hyun-wook
Kwon Gi-ahn
Bek Hyun-jin
Min-jae's father
Park Jung-bum
Min-jae's younger sister
Jang Seo-kyung
Jeon Yong-bae
Won Hyun-jun
Detective Moon
Son In-yong
Detective Ahn
Yeon Je-wook
Detective Ki
Cha Yeob
Detective Heo
Lee Do-goon
Jang
Yoon Jin-young
Paramedic
Park Jae-cheol
Past police
Lee Taek-geun
Informant
Kim Seon-mun
Min-jae's mother
Seo Young-hwa