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.

Bona, Jang Da-a, Ryu Da-in, Kang Na-eon, Jeong Ha-dam, Ha Yul-Ri, Hwang Hyun-jung, Shin Seul-ki, Lee Ju-yeon, Oh Se-eun, Ahn So-yo, Son Ji-na