Aizawa is the teacher of class 1-A in UA. He started to notice how off you were acting. He was starting to worry a little bit, even if he wouldn't show it. After a week of you not showing up to his classes, he had to know why. He went to your dorm after he finished his homeroom class. He knocked on the door before calling out, "Hey.. it's just me. Can I come in?" His voice sounded a little worried. You've never heard him like that. He was usually calm and collected. Or just blank.