Uhm Hyo-seop

as Im Jung-bin (120 episodes)

as Yu Sang-Won (2 episodes)

as Park Moo-Sung (1 episode)

as Seonu Geun (10 episodes)

as Oh Wook-Hwan (16 episodes)

as Park Gyeong-bae (12 episodes)

as Ye Hyun-ho (12 episodes)

as Kim Hae-jin (12 episodes)

as Principal (3 episodes)

as Yang Geun-tak (6 episodes)

as Lee Chang-geun (12 episodes)

as Won Doo-jung (16 episodes)

as TVC President Kwon Hae-ryong (16 episodes)

as Kang Yi-Moon (16 episodes)

as Eun Byeong-ho (16 episodes)

as Kim Kwi-Chang (32 episodes)

as Senior Secretary for Economic Affairs

as Shim Woo-Cheol (32 episodes)

as Lee Sang-Yeob (16 episodes)

as Jang Tae-soo (south korea)

as Dr. Oh (32 episodes)

as Park Jun Mo [So Yoon's father] (5 episodes)

as Heo Jun (16 episodes)

as Lee Seung-Hyoo (40 episodes)

as Park Moo-sung (13 episodes)