The soul of modern technician Zhao Ming traveled through the Warring States Period and became a dying craftsman outside Xianyang City. When he used vernier calipers and heat treatment technology to create the first spring steel knife, King Yingzheng of Qin heard the news and took action. From standardized arrows to hydraulic blowers, from Chidao concrete formulas to military levels, Zhao Ming used the industrial thinking of seventy years later to crazily transform Daqin. But Li Si stared at his statistics and turned them into laws. Meng Tian swept through the three Jin Dynasties with his three-stage crossbow formation. Han Fei wrote "Cun Han" and tore it up amidst the roar of iron tools - and Ying Zheng on the throne had quietly asked someone to build the "Taea Gai" sword according to the drawings drawn by Zhao Ming. When Lao Ai rebelled and Zhao Ji plotted to seize power, Zhao Ming discovered that he not only brought the speed of unification, but also the ambition to awaken the ancestors in advance.