Once More

In senior high, Yang Mu Li and Xun An drifted apart because of a misunderstanding. Seven years after graduating, they’ve both returned to their alma mater as teachers: Yang Mu Li as a two-faced math teacher, and Xun An as a cool and aloof PE teacher. But it seems that Yang Mu Li… doesn’t recognize Xun An?!
Though many things have remained the same, the people themselves have changed. Can the feelings that once died come back once more? Meanwhile, the secrets they held during that one shared year of high school are slowly revealing themselves…