Kang Suk-won

as Investigator (Eps 5)

as Detective

as Seung-gil

as Gear complainant

as Senior Detective

as Head of Department Kang

as Teacher Suk-won

as Seung-won's Co-worker

as Male Talk Show Guest

as [Babel Chemicals team leader]

as Choir Member

as Care Worker

as Do-bin

as Taxi Driver

as Reporter 4

as Machinery Team Leader

as Hyung-joon

as Prisoner 1

as Behavior Examiner

as Cameraman

as Squad Member

as Fellow Detective

as Taekwondo Team Coach

as Gangneung Police 3

as police officer

as Situation room agent