Kim Kang-hoon

as Young Lee Chang-ho

as Yang Che-il (teen) (1 episode)

as Park Jin-seo (12 episodes)

as Kwon Hyuk-soo (1 episode)

as Jin Do-joon (young) (2 episodes)

as Lee Do-il's Son

as Teen Noa (5 episodes)

as Park Dong-gu (12 episodes)

as Kangchun Family / Nephew (8 episodes)

as Young Joon-kyung

as Lee Yong-tae (16 episodes)

as Boy

as Young Jae-hoon (3 episodes)

as Nam Do-san (young) (4 episodes)

as Goo Do Kyung (young) (32 episodes)

as Bae Young-guk's Son

as Kang Pil-gu (40 episodes)

as Woo-jong

as Ji-ho

as Young Goo Chan-sung (2 episodes)

as Cha Eun Ho [Young] (1 episode)

as King (1 episode)

as Ye Joon [Secretary Gwon's son] (3 episodes)

as Han Si-wan (32 episodes)

as 아들 (4 episodes), Creator