Lin Xiaoman, a 21st century mathematics prodigy, traveled through the Kangxi period while restoring ancient books in the Forbidden City. She used calculus to analyze the grain shortage in the northwest and was involved in the struggle for the legitimate rights of the nine sons. Use probability theory to deduce the floods of the Yellow River and decipher Western artifacts using binary systems. He also developed emotional bonds with the seventh prince, the prince, etc., Collided with missionaries, and started a legend of knowledge rewriting history in the torrent of history.