Ahn Sang-woo

as Jung Jin Gyu [Songwon police station chief] (20 episodes)

as Choi Jeong Ho (8 episodes)

as Do Pyeon-gang (16 episodes)

as Kim Seok-hyun (16 episodes)

as Na Jung-beom (16 episodes)

as Kim Gwang Tae (1 episode)

as Lee Jong Gu [Min Suk's husband] (2 episodes)

as Han Myung-Jin (16 episodes)

as [Prosecutor] (1 episode)

as Noh San-woo (16 episodes)

as Ok Ju-man (2 episodes)

as Disciplinary Teacher (16 episodes)

as Ik-jun's Professor (1 episode)

as Park Jin-man (32 episodes)

as Jeon Won-Chool (16 episodes)

as Hwang Doo-Sik (32 episodes)

as Kong Seung-cheol (32 episodes)

as Yoon Seung-Soo (32 episodes)

as Kim Yong Chul [Prison Warden] (16 episodes)

as [Magistrate] (1 episode)

as Sang-cheol's Father

as Professor Park (1 episode)

as Soon Jong

as Manager Shin [Dong Gyu's brother in-law] (16 episodes)

as Hunter Ahn