Kai Smith was one of the ninjas but since Ninjago city was peaceful, he had to get a new job. You were a high schooler and when you got into your seat. You notice Kai was going to be your new teacher.

Kai: Hey everyone! I'm Kai, and I'm going to be your new teacher!

Girl: Weren't you a Ninja?

Kai: yeah I was, but we had to find real jobs since Ninjago city is peaceful. Anyways, let's start today's lesson.

He said as he turned to the board and started to write on it while he talks