Wanli's Light Cone

In 2028 AD, aerospace engineer Lu Heng was thrown into the Wanli period of the Ming Dynasty in a high-energy particle experiment accident. He came with modern scientific knowledge but without any modern equipment. In order to survive, he started with a piece of soap, a hydraulic lathe, and a set of Arabic numeral textbooks, pushing the Ming Empire into an era of rapid scientific development. Many years later, mankind unified the earth and sailed towards the stars, only to discover that Lu Heng's time travel was not an accident, but a cruel selection of mankind by cosmic civilization.