1587 is a year of peace, the year of dinghai in the lunar calendar (the year of the pig) and the fifteenth year of Wanli in the Ming dynasty. This is an important year, which is called the turning point of the Ming Dynasty by the famous historian Huang Renyu.

The historical event of 1587 is also an opportunity to make waves in the future. Look at history from another angle and make the world more stereoscopic. 1587, the year before the Spanish fleet was sent to Britain in the history of western Europe. At that time, a number of events that were easily overlooked by historians occurred in the Ming Dynasty. Although these events look like the last section, they are actually the crux of the major events that happened before, and they are also an opportunity to set off waves in the future. Causality is only the focus of history. The main idea of his book is seen in the last paragraph of the book: "When a country with a large population, everyone's actions are limited by the simple and superficial principles of Confucianism, and the law lacks creativity, the degree of social development will inevitably be limited. Even if the purpose is good, it cannot subsidize technology. "