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The film opens with a stark portrayal of high school bullying. A group of students tortures a young boy by placing an apple on his head and preparing to throw knives at him. Amy, a compassionate student, intervenes, only to reveal her own tragic story—her brother Yu was a victim of bullying and was murdered by a similar group. In a shocking turn of events, she retaliates against the bullies with swift violence, showcasing her formidable skills and marking a pivotal transformation from a kind-hearted girl to a relentless avenger.