Lee Yoon-geon

as Hong Seung Pyo [Police commissioner general] (8 episodes)

as Kim Soon-ho (12 episodes)

as Ho-cheol

as Judge

as King

as Park In

as Joong-gil

as Park Yong-geon

as Cho Sang-yong

as Seong-ho

as Detective

as Park Chul-woong

as Kang Ki-tae

as Aide

as Kim Sang-soo

as Yoon Jong-won

as Byeon Won-gyu

as Detective Kim

as Sang-cheol

as homeroom teacher

as Kuboda

as Special Investigation Team

as Detective