Kim Won-hae

as Ko Seong Jae

as Oh Man-seok (1 episode)

as Hwang In-sik (Lizard) (12 episodes)

as Yun Jae-beom (16 episodes)

as Kim Yeong-hwan (10 episodes), as Kim Yeong-hwan (voice) (1 episode)

as Do Yeong-nam (1 episode)

as Cheon Gwang-soo (2 episodes)

as Cho Hyeon-sik (10 episodes)

as Doctor Oh (Prologue)

as Na Dae-bok (12 episodes)

as Hong Jae-hun (8 episodes)

as Choi Won-bong (12 episodes)

as Former Team Leader

as Kim Bok-nam (8 episodes)

as Ryu Geun-deok (16 episodes)

as Gong Moon-sik

as Polearm seller (1 episode)

as Dr. Cheon's Grandfather

as Uncle Broker

as Gi-nam

as Seo Moon-choon (12 episodes)

as Son Yong-rak (14 episodes)

as Choi Yong Sik (1 episode)

as Jang Jon-ho (1 episode)