Koo Jin-woo
Ban Ji-ha
Kim Dong-hyun
Oh Dong-Kyung
Kang Seon-ho
Self
Mentor
Kim Yoonseong
Jung Poong-san
Hae-jun's son from the future
Daniel Han
Kang Se-Chan / Ray
Park Chan-young
Daniel
Seo Do-Hyun
Jinyoung
Geum Kang San