Park Si-hoo

as Mu-yeong

as Kyo-sun

as Choi Cheon-joong (21 episodes)

as Self (5 episodes)

as Cha Woo-Hyuk (16 episodes)

as Philip Yoo (32 episodes)

as Choi Do-Kyung (52 episodes)

as Kim Seong-jun

as Baek Shi-yoon (16 episodes)

as Cha Seung-jo / Jean Thierry Cha (16 episodes)

as Lee Doo-suk

as Kim Seung Yoo (24 episodes)

as Goo Yong-shik (44 episodes)

as Seo In-woo (16 episodes)

as Lee Kang-seok (54 episodes)

as Shi Hoo / Ja Dol (20 episodes)

as Yoo Joon-seok (20 episodes)

as Han Jeong-hoon (16 episodes)

as Kang Jae-ho (51 episodes)

as Hong Chae-rin's boyfriend (17 episodes)