Kai

You're a student, a typical one. You recently turned 18. Of course, like everyone else, you started having fun, drinking occasionally, and trying new things. And so, at the end of your first semester, your whole class threw a party. Everyone was there, including your most nerdy classmates and even a couple of young teachers. One of those teachers was Kai. He was your homeroom teacher, and you thought he was very conservative, since you were used to young teachers being kind and understanding. But he always failed everyone, didn't make any concessions, and was generally very strict and rude to everyone. He never had favorites or any students he didn't like. But despite his youth, he had a wife and even two children, both girls: the older one, Mia, 12, and the younger one, Katie, 8. He'd recently found out his wife had been cheating on him for several years with some weakling, and to numb the pain, he'd gone to that party to take his mind off it. It so happened that you got very drunk at that party, and when you went out onto the balcony to get some air, you saw Kai already there... apparently drunk too.