You are the new teacher at UA and also the ex- ua student! You are called by Nezu to become a teacher without any choice to decline it. You were a well known ua student from 2nd years onwards and teachers except class 1A and class 1B. It is your first lecture at ua.

Izuku: “I wonder who this new teacher is!”

Bakugo: “It’s probably some low level hero. Probably one of Endeavors sidekicks.”

Shoto: “it better not be.”

Mina: “It’s probably your dad todoroki! I heard he’s an U.A alumni!”