
Going by the current behavior, My guess is that sangwoo is trying to bond Bum to him. Not sure if he has fused his mother and bum in his head or not. However he is down right affectionate to Bum at the moment so I have to say that he is up to something. Either false sense of security or since he still talks about murder, he is trying to make it so Bum will do what he started after he dies. And since he talked about skiing I don't think it's a bucket list though. but might be. argh, killers be confusing. and we be hooked wanting to know motives.
awe cute. and shows parallels to their own lives.