"Chengyu Middle School", a key high school in Qinglin City, has been established for 60 years and has the highest admission rate in the city. It advertises to the outside world that "civilization, discipline and silence are golden". However, there has been a top bullying gang in the school for a long time - the "Chen Shao Tuan" headed by Jiang Chen, the son of the school director, who has long bullied Lin Wanxing, an introverted girl from an ordinary family.
The school protected the whole process for the sake of admission rate and relationship with the school board; the students kept silent in order to protect themselves; the teachers turned a blind eye. In the end, Lin Wanxing was bullied to death in the women's restroom (compartment 404) on the 4th floor of the senior high school building. After his death, Jiang Chen and others disguised it as a "suicide" and threatened the whole school to shut up. Chengyu Middle School has since become a "silent school."
Three years later, transfer student Su Qingran (with a sensitive personality and yin and yang eyes, who had witnessed bullying in her childhood but did not dare to speak out, leaving behind psychological trauma) was transferred to Class 7 of the senior year of Chengyu Middle School. She happened to sit in the seat where Lin Wanxing was alive, and she was involved in a series of horrific and supernatural incidents. She was forced to uncover the truth about the bullying and death three years ago step by step, confront the school, the perpetrators, and silent bystanders, and finally let the dead soul rest in peace and break the "silence" curse.
