On the day when the engagement of Shen Yunjin, the legitimate daughter of Marquis Yongning, was annulled, the whole capital was waiting to see her joke. No one knew that her mother was a descendant of the Gusu Suan Sect, and she inherited a terrible talent - she could find three frauds by looking at an account, and she could calculate the moisture content by touching a handful of raw silk. She went to Suzhou with a jade plaque engraved with the word "Suan". Starting from a broken silk shop, she fought against Shanxi merchants, controlled Jiangnan, and opened up the Maritime Silk Road. Three years later, she was the first female business saint in the Zhou Dynasty; five years later, the prince knelt down and begged for cooperation: "Marry me." She asked in return: "How should the equity be divided?" Later, she became the first regent queen of the dynasty, sitting in the court with the emperor. This is the story of a woman who uses mathematics to change the world - not counting fortunes, only settling accounts.
