Jung Won-joong

as Kim Woo-won (16 episodes)

as Go Hyeong-soo (16 episodes)

as Gong Suk Hwan (122 episodes)

as Fire Marshal

as Mo Cheol-hee (16 episodes)

as Party Leader

as Kang Il-Kook (40 episodes)

as Byoung-woo

as Ma Hyun-Cheol (16 episodes)

as Kim Myung-bae, Commissioner General of the National Police Agency

as Park Byeong-jin

as Chief of the National Police Agency

as Lee Won-soo

as Dong-il's older brother (1 episode)

as Assistant

as Sang-ho

as Police Chief

as Senior

as Kim Woo-suk (16 episodes)

as Corps Commander

as Kim Sang-pil

as Lee Chang-hyeok (20 episodes)

as Middle-aged Man

as Park Jae-gi