Seong No-jin

as Choi Ki-taek (12 episodes)

as Principal (1 episode)

as Yoon Dae-myeong (2 episodes)

as Heo Tae-beom (1 episode)

as Kim Dae-bong (2 episodes)

as Trainer Song (12 episodes)

as Chief prosecutor (1 episode)

as Construction worker (1 episode)

as Joy Card bowling club employee (1 episode)

as Forensics examiner (2 episodes)

as Park Cheol-u (2 episodes)

as Kim Myung-soo (adult) (1 episode)

as Doctor

as Police