Rat Poison Death Part 2: Bum tries to let Sangwoo know he's still there and curls up to him when he sleeps. Sangwoo interprets these things as negative and thinks they are trying to kill him. He keeps seeing Bum everywhere in fleeting glances (shadows on the walk maybe in the bright light) and tries to kill him or hold him. Sangwoo's crippling guilt/fear causes him to become more clumsy and Sangbae is able to gather evidence. It ends with Sangwoo committing suicide or locked up with Ghost Bum.