Kang Suk-won

as Investigator (Eps 5) (1 episode)

as Detective (1 episode)

as Seung-gil

as Jin Myeong-chul's Secretary (2 episodes)

as Gear complainant (1 episode)

as Senior Detective

as Head of Department Kang

as Teacher Suk-won

as Doctor

as Seung-won's Co-worker

as Male Talk Show Guest (1 episode)

as [Babel Chemicals team leader] (2 episodes)

as Choir Member

as Care Worker

as Do-bin

as Taxi Driver (1 episode)

as Reporter 4

as Machinery Team Leader

as Hyung-joon (1 episode)

as Prisoner 1

as Behavior Examiner

as Cameraman

as Squad Member

as Fellow Detective

as Taekwondo Team Coach