Donghae's mother had gotten a job to be the super intendent of a school. And all girls school. He is forced to move there with his mother - but that comes with one little problem. He is the only male. Only male student that is. There is also Mr. Lee - a Math teacher. His Math teacher.

Donghae's mother will not allow her son special treatment, so the boy is not allowed to stay with her in her special cabin, but allows him to stay with the only other male on campus.

Mr. Lee.