Su-wan's mother works in their family business, selling fried chicken. To help out, Su-wan earns money by tutoring other children, but often gets fired after hitting the students. Her mother has a rich friend with a son in need of a tutor. The friend, Kim Ji-hoon's mother, wants a tutor that will make her son study so that he can pass his high school graduation exams. The salary offered is enough to pay for an entire semester of Su-wan's college education.