Seo Suk-kyu

as Detective 1

as Reporter Kim Seong-il

as Consignment Specialist (1 episode)

as Doctor

as Apt. 304 Resident

as Jin-suk's Son

as Actor (1 episode)

as Woo-jin's uncle

as PD (1 episode)

as Jin-woo

as Woo-seok

as Lee Dong-woo

as Man Upstairs

as Yoo Tae-wook

as Reenactor

as NIS Shooting instructor (2 episodes)

as Wedding guest (1 episode)

as Helmsman

as Newlywed / Airplane passenger

as Moon Do-seok's Fellow Detective

as In-hyeok

as Math Teacher

as Seung-won's Father (1 episode)