The Rusty Iron City is like a giant machine that is rusty but constantly running. The upper-class nobles hide under the brass dome and use steam pipes to monopolize "pure energy." The lower-class people can only survive in the slums where the gears are interlocking, by repairing abandoned machinery. Mechanic Ling Fan's daily life was to dismantle old parts in a workshop full of engine oil smell, until he picked up a bronze gear engraved with strange patterns - when the gear rotates, it can interfere with the noble's exclusive steam signal.
At the same time, Mo Ning, who was wearing brass goggles and had a mysterious whereabouts, was being hunted by the mechanical dogs of the city defense army. She held half of a incomplete blueprint in her hand. The symbols on the blueprint were exactly the same as Ling Bao's bronze gear. An unexpected collision involved the two in a cross-class conspiracy: the "energy purification plan" in the mouth of the nobles was actually a scam that used mechanical cores to extract people's lives.
When the bell tower of Rusty City began to make a shrill noise, and when the abandoned steam train suddenly restarted, Ling Fan's wrench and Mo Ning's blunderbuss became the only hope to break this "man-eating machine". But they didn't know that behind the bronze gears, there was a more terrifying secret about the origin of Rusty Iron City.
