Yeon Woo-jin

as Baek Tae-Ju (12 episodes)

as Dr. Kang

as Woon-cheol (segment "Metamorphosis")

as Kim Do-hyeon (12 episodes)

as Kim Tae-hun (16 episodes)

as Dong Go-yun (12 episodes)

as Mu-kwang

as Kim Sun-woo (12 episodes)

as Doo-sik

as Han Jung Hyun [Young] (16 episodes)

as Chang-seok

as Jo Min-guk (10 episodes)

as Jang Yoon (32 episodes)

as Oh Soo-Min (16 episodes)

as Choi Moo-hyeok

as Self (1 episode)

as Yoon Shi-kyung

as Huyga

as Sa Ui-Hyun (32 episodes)

as Woon-chul

as Lee Yeok / King Jungjong (20 episodes)

as Eun Hwan-Ki (16 episodes)

as Self (1 episode)

as King Hyojong