as Seong-ho
as Kim Kang-hoon(2 eps)
as Oh Won-seok(1 ep)
as Yang Gwan-sik (child)(6 eps)
as Joseph(2 eps)
as Bo-ra's Brother
as Han Min-beom(1 ep)
as Gyeol-yi(1 ep)
as Song Ha-young (young)(2 eps)
as Orphanage Boy(2 eps)
as Won-jun(1 ep)
as Little Boy(1 ep)
as Self - Guest(1 ep)