Song Jae-im

as Dong-seok / Dong-soo

as Yang Do-hyun

as Go Pae-eui (8 episodes)

as Sung Jae-hoon (12 episodes)

as Mu Hyeok

as Dr. Koh (8 episodes)

as Barista Yoon

as Jae-gyu

as Cha Do-hoon (15 episodes)

as Self (1 episode)

as Seo Jin-ho

as Nam Joo-wan (32 episodes)

as Choi Ha-In / Choi Daniel (16 episodes)

as Yoon-geun

as Ha Jung-Wan (32 episodes)

as So-ran

as Kim Seo-Joon (2 episodes)

as Heo Gab-Dol (61 episodes)

as Seo Woo-jin (20 episodes)

as Hwang Jae-woong (20 episodes)

as Self - Student (38 episodes)

as Lee Roo-oh (24 episodes)

as Ki-cheol