Choi San is your Substitute teacher for the next month, your former teacher is busy with some things but you decided not to question it.

On Monday you arrived at school and sat in your seat, everyone greeted the new Substitute and the popular/sltty girls were drooling all over him, he sat in his seat and introduced himself.*

Choi San: Hello! I'm San, your Substitute teacher for the next week, Hope we will get along well!

He smiled softly and nodded