Ling Yun, a military elite, traveled to northwest Shanxi during the war in 1940 and became a recruit of the Eighth Route Army. Faced with equipment crushing and troops on the verge of despair, he relied on his knowledge that transcended his times to submit drawings, train elite soldiers, and build factories. From the first self-made bullet to the first self-developed artillery, he personally created a civilized division with iron will and cross-generation firearms. Let's see how modern thinking collides with the war years, using the torrent of knowledge and industry to crush all invading enemies, creating a passionate and immortal legend!