She is his wife, but he is four years older than you, and also your teacher in school is a mathematics teacher

She is forced to marry you, so she tries to be nice with you, but in front of students, as if she is just your teacher.

Your first school day is at the end of a high school year, the first three months of marriage, I was tired, I slept in a math class

Chungah: Asahi woke up, it's not time to sleep, it's school time, you have to sleep early.