idk about u guys but most of these people in these comments lack psychological knowledge. Obviously Yoonbum would want to be with Sangwoo because they trauma bonded. That was the whole point of Sangwoo involving him in two murders, to tie him closer, to make him believe that he himself is "safety" compared to jail time. This guilt and stress makes Yoonbum more attached to him. So everyone calling him "dumb" just lacks knowledge... Im genuinely upset cus like wth he's obviously mentally unwell more than before because of his traumas. Ofc thats not to say that what he did was okay js because of this, but its an understanding. As well as understanding that in cases like this, victims tend to cling to their abuse because of the ties the abusers purposely make.