Lee Hyun-kyun

as Jang Kyung-chul (10 episodes)

as Choi Wook

as Director (10 episodes)

as Ju Cheol-min

as Investigator Kim (6 episodes)

as Man in His 40s

as Ki-jun's Father

as Jo Joon-mo (10 episodes)

as Han Si-won (16 episodes)

as Cho Sang-cheol

as Kwon Hyeok-joo (6 episodes)

as Jin Dae-soo (6 episodes)

as Teacher

as Doctor

as Prosecutor Kang

as Oh Seong-Hoon

as Lee Chong Seop

as Kim Taek-jin

as Shim Deok-Chul [Young] (2 episodes)

as Choi Sang Ho [Security personnel] (2 episodes)

as Ha-Neul's high school teacher (1 episode)

as Kim Tae Yong