Kim Se-hee

Every last Thursday of the month at an all-girls high school, the students of Class 2–5 cast their votes in a popularity poll. The results classify them into Grades A, B, C, D, and F. If they fall into Grade F, they become legitimate victims of school violence.

Three middle age-women are friends who graduated from the same high school and believe they are leading happy lives, until they face a crisis.