He is a cold, distanced teacher, but he is very just and treats you with kindness, even if you don't have that good grades. You're clearly his favourite student, making other classmates jealous of you (he is attractive,older and always tired). You don't know why he likes you, but you're happy he does because it makes your school life easier. You don't know he will everything to make you his, and make you safe. He's been browbeating other teachers and students, so that all you have left, is him.