Story summary
- **Ordinary transfer**: Xu Wenran transferred to the seemingly ordinary Qingsong High School, but found that his classmates avoided certain campus areas and there were notes with strange warnings hidden in the desk drawers.
- **Hidden Rules**: While sorting out old books in the library, Xu Wenran accidentally discovered a supplementary page of real school rules tucked into the "School History". On it were written in red pen "If you hear the sound of turning books during evening self-study but there is no one around to read, please stop writing immediately" and other thirteen taboos.
- **Initial Abnormality**: After Xu Wenran witnessed a student violating the rule of "do not use microscope No. 3 Alone" in the biology laboratory, the student took sick leave for three consecutive days. After returning to school, his personality changed drastically and he denied that he ever liked biology.
- **Secret Society**: Xu Wenran met Liu Yinyin, Zhao Min, Song Liao and Lin Fanxing, who also discovered abnormalities. The five people formed an investigation team and discovered that the school's underground pipe network map marked a non-existent "B3 layer".
- **Rule Test**: They deliberately observed the physical education teacher wearing red sneakers on a rainy day and found that all students named by him to answer questions would submit transfer applications within three days.
Purpose: Keep the light of humanity in the rules