Ko Seong Jae
Cho Hyeon-sik (10 episodes)
Doctor Oh (Prologue)
Na Dae-bok (12 episodes)
Hong Jae Hun [Director of Planning and Coordination] (8 episodes)
Ko Dok-seong (12 episodes)
Choi Won-bong (12 episodes)
Former Team Leader
Kim Bok-nam (8 episodes)
Ryu Geun-deok (16 episodes)
Gong Moon-sik
Polearm seller (1 episode)
Dr. Cheon's Grandfather
Uncle Broker
Gi-nam
Seo Moon-choon (12 episodes)
Son Yong-rak (14 episodes)
Choi Yong Sik (1 episode)
Jang Jon-ho (1 episode)
Cho Gi-bong (4 episodes)
Seong-bong
CEO Hwang (16 episodes)
Park Pil-joo
Heo Gil-pyo (12 episodes)
Ryu Seung-deok (16 episodes)
Kim Hyeon-cheol (12 episodes)
Jung Se-joon (16 episodes)
Hwang Byeong-cheol (16 episodes)
Ahn Gi-chang
Nam Seong-hwan (16 episodes)
No Won-hae (1 episode)
Park Choong-Jae (8 episodes)
Bin-dae
Jo Sun-saeng
Kwon Hyeon-seok (16 episodes)
Seok-Hwan (1 episode)
Ma Dong-sik (16 episodes)
Kong Soo-Rae (16 episodes)
Park Gyu-ho (1 episode)
Math Teacher (16 episodes)
Boss Jeong
Yoon Suk-ho (6 episodes)
Gil Gong-Tae (16 episodes)
Sun-joo
Team Leader
Park Tae-hee (32 episodes)
Jang In-Kyu (14 episodes)
Han Sang-Sub (32 episodes)
Lee Dong-Soo (16 episodes)
Kang Jae-Sik (36 episodes)
Kim Jung-Soo (1 episode)
Crime Department Chief Jo (16 episodes)
Kim Eung-jib
Kim Gye-cheol (1 episode)
Na Gwang-Gyun (18 episodes)
Choi Dam-dong (32 episodes)
Peninsula Hotel Manager
Kim Kwang-bok / Oh Dol-pyo (16 episodes)
Choo Nam-ho (20 episodes)
Police Officer
Akeo / Alligator
Kim Won-Hae (16 episodes)
Mr. Kim (2 episodes)
Kim Gye-Chul
Min Byung-Ho (50 episodes)
Chief Ban
Young-chul
Goo-cheol
Kim Gye-chul (16 episodes)
Kim Moo-young
Son Se-Woon (16 episodes)
Lee Myung-gook (1 episode)
Han-gil (1 episode)
Tank Commander
Program host
District Magistrate (cameo)
Park Young-ho (1 episode)
Taxi Driver
Artist Jo
Choon-seop
Han Yeong-seok (17 episodes)
Baek Seong-chul
Unidentified Mr. Jang
Eunuch Hong (16 episodes)
Self - Various Characters (71 episodes)
Teacher
Police Officer