Kim Mu-saeng

as Chairman Kang (20 episodes)

as Tae-shik's father

as Lee Pil-deuk, Kyung-min's grandfather (16 episodes)

as Choong Won Kong (30 episodes)

as Professor Han

as 박성달 (1 episode)

as Lee Seong Gye (159 episodes)

as Jo Sa Seok (63 episodes)

as 후쿠다 (16 episodes)

as Chang Myon (41 episodes)

as Lee Soon Shin (55 episodes)

as King Taejo (27 episodes)

as Jo Sa Seok (60 episodes)