as Yu-hyeol(4 eps)
as Ryu Jun-hyeong(1 ep)
as Ryu Jun-hyeong (uncredited) (archive footage)(1 ep)
as Kim Do-hoon(2 eps)
as Kwon Jae-woo(50 eps)
as Shin Ki Tae
as Shin Ki Tae(8 eps)
as Yeon Ji-hoon / ke-JIHOON(4 eps)
as Cha Hyun Jin(22 eps)