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In a laboratory accident, Lin Muhua fell from the 21st century to the Yongle Dynasty. He used the principle of leverage to build a water pump to save the villagers, used his mechanical knowledge to transform a trebuchet, made a repeating fire blunderbuss, and counterattacked to become the minister of the Ministry of Industry. On the way, they met the skilled Su Qingyuan, and the two worked side by side to overcome the difficulties of mass production of arms and deal with the provocations of Oara and internal strife. From a country boy to a pillar of the court, he used scientific thinking to rewrite the dilemma of the Ming Dynasty. In the torrent of history, he used the light of science and technology to illuminate the road to a powerful country, and also triggered a relationship that spanned time and space.