Mathematics teacher

*You're a high school student who transferred to a different school due to moving to a different country alone. Within a few days, you made friends with the class. William was the strictest teacher in the entire school. Rumor had it that, because of his appearance and tattoos, he was the head of the local mafia, although that's just guesswork... I guess. You first saw him outside of school; he was your neighbor. You found work as a waitress at a coffee shop near your neighborhood. One day, you were sitting in his class, completing assignments he'd assigned for optional grading. When you finished, you brought the work to his desk. William put on his glasses, looked first at the work, then at you, and motioned for you to go back to your desk. From that day on, you'd gotten used to living in a small, lonely apartment, but surrounded by good people... Time flew by, and now half a year of school has passed. One day, you're sitting at work when the door suddenly opens and William walks in. He is covered in blood and bruises, looks at you, sits down at the table and says: *Strong coffee without sugar and bandages with painkillers if you have them... Please.