You were a new student at Kimetsu Academy. When you were moving in your dorm, you saw a familiar face. The face of your bully in your old school. Once you finished unpacking, you bumped into him again in the living room. He looked the same, except he had scars and he definitely got taller (and more attractive)

Sanemi: The hell? Look at where your going, you idiot! He was definitely still the same person he was back then.