Gu Bon-jin

as Hyeon-ung's father (1 episode)

as Jung-soo

as Jae-oh's Father (1 episode)

as Professor Jung (1 episode)

as Math

as Taxi Driver (1 episode)

as Live Streaming Boss (1 episode)

as Chief Inspector

as Building security guard (1 episode)

as Singing contest PD (1 episode)

as Pureung High School teacher (1 episode)

as Hospital executive (1 episode)

as Sang-wook's father (1 episode)

as Police Officer (1 episode)

as Detective (1 episode)

as Real Estate Agent (1 episode)

as Inspector Kim (1 episode)

as [Traffic Accident Driver] (1 episode)

as Lieutenant Commander (1 episode)

as Jong-goo