Da Qin: It Was Revealed at the Beginning That the Time Traveler Ying Zheng Was Numb

Traveling through three years, he had no golden fingers and no system. He relied on blacksmithing to earn a living. However, he was misunderstood as a rebel and was captured by Qin Shihuang. In this case, I have no choice but to use my 21st century knowledge and power to help Qin Shihuang create the Qin Dynasty for all generations. Make iron tools, develop agriculture, spread science and technology, and make gunpowder. Help China to conquer the Western Regions, unify the world, and conquer the world!