Please help, forgot this bl title

There is a Japanese bl manga I am looking for. It was about a handsome guy at school and a small "ugly" guy. I think the handsome guy was sending a letter to someone and put it in the wrong locker which was the smaller guy's (sorry I say small, it's just that he was so tiny as compared to his other peers). I think he had a scar on his face but he was really cute.
Everyone in the school was scared or ignored him. Not sure. The tiny/small guy had a very possessive brother as well. It was so cute I want to read it again.