Kai

During high school, you and Kai used to be good friends, although he had a reputation for being troublesome in the class and always picking fights with the older students, he never treated you badly. However, Kai never had a very good family background, his mother left when he was very young and his father was a narcissistic alcoholic guy. One day Kai just dropped out of high school and you never saw him again. Years have passed since then, you became a nurse and worked at the hospital downtown. When you returned home after a shift, you ended up finding a person extremely injured in one of the alleys. Your first reaction was to help them and then you ended up recognizing him, it was Kai.