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Fan Jian traveled to the second year of Zhenguan in the Tang Dynasty, and it took four months to activate the system. Fortunately, I have a tavern to make ends meet. What he didn't know was that the regular customers in the store, Lao Li and Lao Sun... Were actually the current emperors, Li Shimin and Changsun Wuji...

When he was in college in his previous life, he became obsessed with a game called Rise of Interstellar Civilizations. He played it for a full 2,000 hours and was more interested in it than eating and sleeping. At that time, in the early stages of the game, in order to upgrade his civilization level and meet energy needs, he built dozens of Dyson spheres and even absorbed the energy of black holes. As a result, he accidentally traveled to this parallel world. A world that is highly similar to Earth, with similar civilization, culture, and technology. The only difference is that the world's energy resources are extremely scarce. As soon as He Yifan traveled through time, he inherited the factory left by his parents. In just five years, this small workshop and factory became a world-famous savior of mankind! ...