Choi Jinri, better known by her moniker Sulli, is the most popular girl in school. But she is also the school’s meanest bully, in contrast to her sweet and cute looks. Together with her gang composed of meanies Krystal Jung, Suzy Bae and Kang Jiyoung, she loves to terrorize helpless students in school. And she had one favorite student whom she often bullies: a shy, quiet boy named Lee Taemin. No one knows why out of everyone she just loves to hate Taemin, who had really done nothing bad to her. But Sulli has her reason, and if it will be discovered her reputation as the meanie bully is doomed.