Son Byung-ho

as 양안 (1 episode)

as Director Shon

as Kang Chan-gil (12 episodes)

as Kim Bong-in (16 episodes)

as Park Geun-soo (12 episodes)

as Park Ki-hyung

as Chief of Security Department (4 episodes)

as Gu Il-hun (16 episodes)

as Jung Gu Yeong (12 episodes)

as Self

as Kim An-jik (20 episodes)

as Song Hyeong-sik (12 episodes)

as Kim Ho Young (2 episodes)

as Hwang

as Professor Choi

as Jeong Heon-cheol

as Kim Byeong-Geun (16 episodes)

as Na Sung-won (16 episodes)

as Mr. Doh

as Kim Gi-tae (16 episodes)