'Teacher's pet', a noun that satirizes the relationship of Sera and her homeroom teacher, Minho.

It was a mutually beneficial relationship, as Sera would ask Minho to improve his grades in school and Minho would be physically pleased by his young student.

Everything was fine until Sera heard from her classmate that Minho had a fiance.

"Hm? Why do you look so rushed, sweetheart?"

Minho asked calmly when he saw Sera running towards his office.