In 1938, the shadow of the occupied area shrouded every inch of the land, and the enemy's and puppet's steam machinery facilities occupied the core of the city like steel behemoths. Lu Jin lurks as a mechanical maintenance worker. His hands can not only manipulate precision gears, but also assemble deadly hidden weapons. Under the airtight surveillance network, every intelligence transmission is accompanied by a test of life and death, and every mechanical modification hides the spark of resistance. The enemy's and puppet's "Iron Kite Project" is about to be launched. Steam-driven war machines are enough to change the situation of the war. But around him are colleagues with hidden murderous intentions, elusive double agents, and contact points that may be exposed at any time. In the oppressive atmosphere, Lu Jin struggled in the gap between steel and flesh, using silent persistence and decisive actions to ignite a weak but stubborn dark flame in the darkness, just waiting for the dawn to penetrate the roar of the gears.
