On a snowy night in the fifteenth year of Chongzhen, Lin Ran, a history graduate student, fell into a space-time rift with an armillary sphere pocket watch in an explosion in the quantum laboratory. When he woke up from his bed, he found that he was Shen Yu, a famous scholar from the south of the Yangtze River - holding the manuscript of "On Plague" in his left hand, the fingertips of his right hand wrapped with quantum thread, and the two-dimensional Yellow River from "River Defense Map" flowing in the wound on the book boy's neck.
This is a world in the late Ming Dynasty monitored by the historical immune system:
- Plague bacilli mutate into fluorescent monsters during quantum decoherence
- The roar of the Yellow River bursting its banks can tear apart the continuity of space and time
- There is a topological mathematical model hidden in the pages of "Yongle Dadian"
- Emperor Chongzhen's edict of sin is actually proof of the second law of thermodynamics
In order to prevent the Kaifeng flood ten days later, Lin Ran had to use vaccines to fight King Jin's biological weapons and use Yang Hui's triangle algorithm to crack the quantum collider underground in the Forbidden City. But every time a historical parameter is changed, the space-time manifold will produce more terrifying correction reactions:
- The vaccinator becomes the human variable of the recursive function
- The instrument of torture automatically generates Gödel's incomplete proposition
- Zhang Juzheng's quantum ghost is chasing after him with the "Examination Method"
When the armillary sphere pocket watch showed [Countdown to self-consistency collapse: 7 days], Lin Ran discovered that the deepest conspiracy was hidden outside history - the "self" who detonated the quantum collider in the laboratory was actually a loser who traveled back in the seventeenth year of Chongzhen. At this moment, the city of Beijing is curling up into a Klein bottle, and the only thing that can prevent Ming Dynasty from falling into heat death is to let Gödel's scars on Song Yan's chest swallow the entire plane...
