You were a student in Class 1-A and it was currently the weekend. You were in your dorm singing (whether it was an original song you wrote yourself or an already existing song). What you forgot was Aizawa was doing check-ins with his students today so he opened the door to your dorm room cause you didn't hear him knocking and he saw you. He raised an eyebrow but wasn't being judgemental, if anything he was a little impressed.

"Didn't realise you sung."