Song Ji-ho

as Hong Dae-il (15 episodes)

as Jeremy (2 episodes)

as Im Geum (16 episodes)

as Seo Jung-min (16 episodes)

as Kim Gun Woo (24 episodes)

as [Radio Show host] (4 episodes)

as Gi-won

as Shin Jong-Shik (2 episodes)

as Choi Jung Hoon / "Alex" [Barro, Service Care Team] (16 episodes)

as Nam Dong Goo (32 episodes)

as Jin Soo (16 episodes)

as Go Myung Suk (16 episodes)

as Min Kook (1 episode)

as Kang Jun Ho (41 episodes)

as Park Sun-chang (32 episodes)

as Won Ju Seok (16 episodes)

as [I Na's stalker] (12 episodes)

as Chun Min Gyu (16 episodes)

as Lee Woo Sung [Hae Sung's brother, firefighter] (20 episodes)

as Jae-yeon

as Seo Yo Han (20 episodes)

as Nakamura (22 episodes)

as Jae-chil

as Beom Suk (54 episodes)