Ending
I don't know why but makes me very sad. It was sorta obvious that Kim's brother was the killer and he was getting back the ones who were responsible for their sister's accidental death. He had to be stopped in order to not kill anymore innocent people that would've gotten in the way.
Though, the way it was played out was heartbreaking. Kim holding him in her arms at the end and then fades in to the old building where their sister was tormented and killed at was haunting and depressing.
Anyone agrees or have a different thought about it?