Heo Jeong-do

as Attending physician (2 episodes)

as Kim

as Ki Mo-hyan (16 episodes)

as Pyo Myun-hak (12 episodes)

as Yi So (12 episodes)

as Park Bok-gyu (16 episodes)

as Sun-woo's Father

as Kang Jun-sang (16 episodes)

as Homeroom Teacher

as Kim Joo-ryeon (9 episodes)

as Wie Jang-byung (12 episodes)

as Seok-joo

as Team Leader Oh

as Uhm Dae-hyup (12 episodes)

as Boss

as Lee Gyeong-pil (12 episodes)

as Park Dong-pil (6 episodes)

as MRK

as Football Newscaster (voice)

as Ki Deok-chul (16 episodes)

as Jin-a's blind date (1 episode)