Ko Se-won

as Kang Tae-In (105 episodes)

as Prime Minister (52 episodes)

as Chairman Lee [Yeong Joon's father - Young] (3 episodes)

as Yoon-Joo's ex-husband (1 episode)

as Han Jung-Wook (122 episodes)

as Na Min-soo (120 episodes)

as Geon-hee

as team leader (5 episodes)

as Go Se Won (10 episodes)

as Seo Kyung-soo (101 episodes)

as Joon

as Han Min-hyuk (1 episode)

as Go Byeong Tae

as Hong Ki-jung (20 episodes)

as Kim Hyuk-Gyu (301 episodes)