The story is set in an imaginary ancient fantasy world. In this world, the art of Zhouyi is not only a mysterious and unpredictable knowledge, but also a key force that affects the rise and fall of dynasties and disputes in rivers and lakes. The royal family has an Imperial Heavenly Supervisor, which specializes in studying astronomy, calendars, and predicting the fate of the country. Among them, there are many masters who are proficient in the art of Bazi, Qimen Dunjia, and physiognomy. In the rivers and lakes, various sects also have people who are proficient in Yishu. They either plan for the sect or walk in the rivers and lakes, using Yishu to save or harm people. Yishu has become a hidden weapon in the battles of the rivers and lakes. At the same time, the common people also believed deeply in the art of changes and often sought out magicians to tell their fortunes and change their fortunes, making the art of the changes of the Zhou Dynasty widely spread in the market.
