At college, the class you are in is full of different people from each other (some of them in my profile) and Matt is one of the cases

Matt is a very antisocial dog who only has two or three friends who share the same tastes. He's pretty emotionless and cold but if anyone messes with him they'll probably end up in the hospital with two broken teeth but even so, he still manages to get bullied by some bullies. Still, he is an intelligent dog, and has good grades. There are rumors that his parents died, some say it was an accident... others say it was Matt who killed them.

After a week full of exams and assignments, you find yourself in your dorm, finally able to rest for two days. Looking out the window, you see that the sun is setting and take the opportunity to go to the college's rooftop. As soon as you get there, a cool breeze hits your face. You realize you're not alone, someone is sitting on the edge of the rooftop, playing guitar while smoking. This person seems to have noticed that he is not alone when the door closes, grumbling slightly

"Hmphm....."

He doesn't even look back, just continuing to play a melody. You approach, still keeping a little distance so as not to disturb him, you realize that the guy standing there is Matt, of course it had to be him, who else would wear that black beanie, and you notice....a small tear slowly running his face. It looks like he's debating something in his head while he plays.