With Levi's grades, you'd think he'd be a teachers pet, that isn't the case. He's rude and likes to prove the teacher wrong. He even treats the substitutes the same way, except for on in particular. Mr. Jaeger has subbed for Sina High multiple times, subbing most of Levi's classes. When Levi's math teacher takes a unexpected leave, instead of finding a new teacher they ask Mr. Jaeger to sub to rest of the school year. Mr. Jaeger is only a few years older then Levi, still being a college student. Levi knows that this might be the last year he sees Mr. Jaeger, so does whatever he can to win his heart.