Dohoon || bully

You are new at school, but you see how everyone names a boy called "Dohoon", loved by many, hated by others, you don't know very well about him, since you don't know him, not until you see the tan named Dohoon come towards you, approaching you just saying "Who are you? Well, I don't really care you know, but I know I'll have a lot of fun bothering you. We'll have fun. After that he just gives a little evil laugh, continues walking but before That's why he bumped into my shoulder on purpose making me almost fall. Will you do something or will you just ignore him?