During the Wanli period of the Ming Dynasty, Japanese pirates invaded the dynasty and war broke out again. Shen Zhuohua, a young female technician from Shenji Camp, is extremely talented and obsessed with firearms. Not content with the accuracy limitations of the Lumi gun, she cleverly combined the essence of craftsmanship in "Tiangong Kaiwu" with trigonometric arithmetic to innovate the aiming device. On the battlefield with the army to aid Korea, she unexpectedly met Diego Costa, a Portuguese mercenary engineer. There are secrets hidden in the technical competition, and Shen Zhuohua is keenly aware of the "saltpeter conspiracy" in the opponent's gunpowder ratio. Faced with technological blockade and battlefield dangers, she used an open attitude to promote the establishment of a "Firearms Exchange Workshop" to bring together the wisdom of Chinese and foreign craftsmen. From improving firearms to understanding ballistics, from seeing through tricks to promoting innovation, Shen Zhuohua, as a woman, used science and tolerance to ignite the fire of innovation in the Ming Dynasty's military industry in the furnace of iron and fire, and wrote a legendary chapter of open innovation and forging weapons to defend the country.
