Koo Ja-geon

as Kim Jun-u (3 episodes)

as [Barista] (2 episodes)

as [Baduk player] (1 episode)

as Student (1 episode)

as Track and Field Athlete

as Prisoner (3 episodes)

as Jeong Pal (8 episodes)

as [Sungkyunkwan scholar] (1 episode)

as Kwon Tae-gi's friend (2 episodes)

as College Student

as [Da Hyeon's ex] (1 episode)

as Bus passenger (1 episode)

as [Delinquent] (2 episodes)

as Job interviewee (1 episode)

as College Student (2 episodes)

as Bank security guard (1 episode)

as Guy Waiting in Line with Friend (Denim Jacket) (1 episode)

as Recruit (2 episodes)

as [Food palanquin bearer] (1 episode)

as Woo Hyun (24 episodes)

as Kim Sung Hoon (11 episodes)

as Ha Tae Sung (12 episodes)

as Oh Seung Woo (10 episodes)

as [Oh Dol's friend] (16 episodes)

as store employee 1