Kang Suk-won

as Investigator (Eps 5)

as Detective

as Seung-gil

as Jin Myeong-chul's Secretary · 2 episodes

as Gear complainant

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

as [Babel Chemicals team leader] · 2 episodes