
Guys, let's not forget Siyun actually used to be a very charismatic guy before the accident which left him feeling all alone. He wanted to be loved by everyone, so when he became alone, he became obsessed with the only person who loved him and did everything he could to keep her to himself. But now that he's healing, he's coming out of the dark part of him life and going back to his past charismatic, happy self. He's not a born psychopath.