Ok Chan-Mi (Shin Ye-Eun) is a 19-year-old high school student. She used to be a shooter for a high school team. One day, Ok Chan-Mi's twin brother dies. She chases after the truth related to her his death. She gets involved with Ji Soo-Heon (Lomon). On behalf of bullied students, Ji Soo-Heon takes revenge on their tormentors.