Heo Dong-won

as Hwang Cheol-gwang

as Jin-cheol

as Lee Sang-mok (12 episodes)

as Kim Young-su (12 episodes)

as Wolwolse Man

as Kwang-seok

as Chang-su

as Coach Yeon (12 episodes)

as [I Jun's father]

as Detective Choi Jong-hun (1 episode)

as Teacher Chu (6 episodes)

as Han Hee-sang

as Shin Il-su (1 episode)

as Yang Jun ['Skin Nation' chairman] (16 episodes)

as Oh Dong-gyun

as Dodari

as Staff

as Sang-hoon

as ○ Mask (1 episode), as Player 028 (3 episodes)

as Kim Tae-jin (16 episodes)

as Heo Je-hun (1 episode)

as Aquarium manager

as Detective Shim (16 episodes)

as Sauna Manager