With the "reverse research and development" of military technology as the core, it tells the story of a technician on the battlefield behind enemy lines, using modern industrial thinking and the weapon drawings in his memory to gradually upgrade equipment for the Eighth Route Army under conditions of extreme scarcity. It is not simply a matter of killing the enemy, but integrating technology upgrading, material collection, avoiding Japanese encirclement and suppression, and hoeing for traitors and anti-trafficking agents, turning the clever use of every resource into an advantage in battle.
