Three years ago, linguist Jin Yuheng lost his beloved wife because of his research on taboo languages. After being traumatized, he changed his career and became a private detective. When strange prophecies reappear in the city, he is forced to return to the taboo realm and join forces with his deceased wife's cousin Lin Yue to investigate.
The two discovered that behind a series of bizarre events, there was hidden the strange power of the Jiuding fragments of the Xia Dynasty - predicting the future, blocking speech, distorting logic, and amplifying emotions.
As the investigation deepened, they uncovered the conspiracy of the mysterious organization Pure Word Society. Its leader, Simo, attempted to recreate the original mantra through aggregation rituals and establish an absolutely pure language order.
Jin Yuheng accidentally obtained the Jiuding fragment, but suffered from the backlash of power, struggling between reason and madness. When the power of the Nine Cauldrons gathers to trigger a vision of heaven and earth, he faces the final choice: Sacrifice himself to seal the original power, or allow the power of words to devour the world?
The ultimate game between truth and humanity begins.