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Charin's life is a tragedy. Rejected from his birth,sold to a crook who would have sold him to red-light district to sell his body. No wonder he grew up with inferiority complex because he knew he was nothing special like Jin. He hated prostitution but he is like a prostitute to Hyehan now.
Charin's actually the leader of the black dogs because of his bravery and charisma that even Hyehan agrees upon. When no other kid in the group was brave enough to fight back against the crook,Charin took the first step. Even Jin was ready to be sold by crook. He might not have the best personality but he is a layered and a deep character.