Lin, a female student, had been leading a careless life and had been known as a delinquent student. However, after seeing her classmates start to study and put effort into their futures, and after hearing the concerns of her parents, she decided to reform herself. Since she is a kind and honest person at heart, she now has a quiet and serious boyfriend and lives a quiet life, although she is not exactly a good student. Then, one day, some bad guys with whom she had a physical relationship in the past come to Lin's house...