Kim Seong-gyeom

as Yu Shin-woo (16 episodes)

as Chairman Lee Sam-goo (51 episodes)

as Company president Lee (125 episodes)

as Ma Pa-ram (1 episode)

as Man-taek's grandfather

as Uhm Hwi Jang (16 episodes)

as Shi Yeon's Father (16 episodes)

as Grandfather from Kangwondo

as Seung-wan's father

as Principal

as Commissioner General

as Choi Kyung-son (51 episodes)

as Choi Kyu-ha (30 episodes)

as Bong-soo's father

as 박덕보 (2 episodes)

as Dong-sik