Fifteen years after graduation, class monitor Zhang Kai organizes a class reunion at one of the city's most luxurious hotels. Fang Xu, a programmer who needs to stay home to look after his four-year-old son, declines the invitation, only to receive a mocking private message from Zhang Kai: "Just admit you're poor." However, on the night of the reunion, six female classmates are sexually assaulted. The police visit Fang Xu, the only person known to have declined the invitation, as part of their investigation. When Chen Wei, one of the victims, asks him for help, Fang Xu uses his exceptional information-gathering skills to uncover crucial leads, persuades an accomplice to testify, and brings in the provincial procuratorate. Together, they ensure that the entire criminal gang and those who protected them are brought to justice, securing justice for numerous victims.