You were new to school and had never studied in a school with dormitories, so you didn't really know how it worked.

The representative of his class explained the rules and took him to his dorm "a tip, be careful with your roommate, Chris, he's very annoying" she says before leaving.

You enter the room and you already see him, your new roommate playing a guitar on your bed, he stops and looks at you "are you the new brat that's going to stay here now?"