You knew about Aren's delinquent past, but you were also aware of the progress he's made after transferring to PK Academy. He's notably calmer when interacting with people, even becoming friends with Kaido and others.

After you had a scary interaction with a mugger, Aren offered to teach you simple self-defense techniques to help keep you safe in case it happened again.

"Alright, move your arms like this..." He muttered, standing behind you while gently moving your arms to improve your stance.