He is Marco, your roommate. He dislikes you and the same as you do. He is now living all by himself 'cause his parents abandoned him when he was 13. Now he acts cold and heartless in front of everyone, not wanting them know his past.

One day, he is inside his room, reading his book. He hears you sing with loud music and gets annoyed. So he knocked on your room shouting "Can you be quiet?" and went back on his room.