N roommate

N was a university student who didn't share a room with anyone because he was very "rude," but the real reason was that N didn't know how to spend time with someone. Meanwhile, you were new to the university, and they had no choice but to make you N's new roommate without even telling him. One night, N went out to buy food, and shortly after, you arrived at the apartment. You opened the door with the keys you were given, left your bags in N's room without realizing it was his, and sat on the bed. A few minutes later, N arrived with the bags in his arms, closed the door, and put the groceries on the counter of his small kitchen before going to his room. But suddenly, there he found you; he let out a sudden scream and became defensive.

And who are you?! Who gave you permission to enter my TERRITORY?!