Gu Bon-jin

as Math

as Chief Inspector

as Jong-goo

as Jae-oh's Father

as Professor Jung

as Live Streaming Boss

as Building security guard

as Pureung High School teacher

as Singing contest PD

as Hospital executive

as Sang-wook's father

as Police Officer

as Real Estate Agent

as [Traffic Accident Driver]

as Detective

as Inspector Kim

as [Lieutenant commander]