Rage

That is a wrong and unjust thing to be said. Just like that case where a maid was sentenced to death for killing her employer who had raped her.

Don't be driven by your rage. She grew up in a messed up environment, she acted that way because that's the only way she knew how to. Besides, she was only a teenager that time. Most teenagers aren't a rational thinker.

Bum also had a messed up childhood. He didn't have any friends and the only one who would talk to him, was her. Once she went on her rampage In front of the whole class, towards Bum. It left a big horrible traumatizing moment in his life he couldn't forget. Why do you think he had killed that other girl while remembering it himself.

What she told Sangwoo was amazingly rude. I believe the money was asked because he didnt have enough money to get Sangwoo a present. A last minute thing, and she was right there. That's probably why he had to go, or it wouldn't of been there.

Bum never really intended to meet her. She could of just past him. But no. She didnt. Being the fact, that he really didn't want to meet her in the first place. I hope she really gets smacked by Bum.

They lack knowledge and experience about people. Children learned things through their surrounding, and they would practice those learned behavior from their surrounding. There's a term for this in psychology, but I don't think you would care.

Just tell me what do you expect someone from that kind of environment would act in that kind of situation? This is the same for the rest of the characters in this webtoon.