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.
Seo Kyung-hwa is a South Koean actress, known for Voice (2017), Holiday (2006) and Pyramid Game (2024).