Lee Je-yeon

as Cha Ji-man

as Park Sung-jae

as Park Hyuk Jun (2 episodes)

as Choi Yun-geun (3 episodes)

as Satan (53 episodes)

as Lee Bang Chul (1 episode)

as Shin Seung Joo (young) (1 episode)

as Jung Soo-bin (16 episodes)

as Jong-goo

as [Hongjae High School Music teacher] (1 episode)

as [Music teacher] (1 episode)

as Dong-jun

as Jin Ki-cheol (16 episodes)

as Seo Jae Ha (16 episodes)

as Bum-suk

as Ki Joon-Soo (32 episodes)

as 이제연 (12 episodes)

as Kim Sung-kyu (20 episodes)

as Public Security Elite Agent (Sewage Culvert)

as Suspended Special Forces Soldier

as Kim Jin-ho

as Young Cheol (32 episodes)

as Wild Horse (1 episode)