Lee Dong-ha

as Director Nam (8 episodes)

as Self (1 episode)

as Kim Yoo-bin (2 episodes)

as Goo Hyun-Sung (16 episodes)

as Ho Joon (1 episode)

as Ho-jun

as Kang Woo-hyun (16 episodes)

as Ryu Seung-min (16 episodes)

as Park Cheol-woo

as Self (1 episode)

as Han Se-gyu (3 episodes)

as Goo Kang Min [Kang Mo's younger brother] (2 episodes)

as Yoon Cheol (16 episodes)

as Prosecutor Lim