Junior high school girl Huijun (Xu Jiao) fell to her death from a height after being bullied on campus for a long time. Not only did the violence not stop, but it even extended to her best friend Xiaotong (Wang Shengdi). However, the bullies also died under the hammer one after another. Behind the serial murders, people who are hard to escape suspicion surfaced one by one: Xiaotong's mother (played by Zhang Junning) witnessed her daughter's mouth being sealed with glue but kept silent, the school worker Lin Zaifu seemed to know the inside story but was indifferent and alienated, and the mysterious man Wu Wang (Huang Minghao) who was secretly spying seemed to be in danger but smiled... Who among them was the rainy night butcher who killed the bully? The police officer Dai Guodong (played by Wu Zhenyu) who investigated the case seemed to be blinded by the illusion. During the investigation, Zong Zong's old stories of hiding filth were revealed, and everyone was pushed to the cusp. Good and evil will be rewarded, and sin cannot escape, and the truth will soon be revealed...