Lee Won-keun

as Kwon Si-woo (8 episodes)

as Ahn Yoo-jun (16 episodes)

as Seung-hyun

as Yoo Myung-hwan (young)

as King Heon-jong

as Jae-young

as Yong-jun

as Hwangbo Yool (16 episodes)

as Kim Jin-Young (10 episodes)

as Chief Hong (16 episodes)

as Jae-ha

as Oh Jin-woo

as Lee Joon-ho (16 episodes)

as Dong Hae-sung (20 episodes)

as Self (4 episodes)

as Kim Yeol (12 episodes)

as Lee Eun-chang (20 episodes)

as Kim Hong-yeon

as Soo Kwon Tae (4 episodes)

as The Boy

as Kang Moo-yeol (young) (47 episodes)

as Kwon Do-young (20 episodes)

as Kim Jae-woon (young) (20 episodes)