Lin Shi, a top watch repairer suffering from hand tremors, returns to the countryside, attempting to use micron-level watch repair technology to save heavy agricultural machinery on the verge of being scrapped. Facing traditional repairmen wielding hammers roughly and scheming, black-hearted vehicle dealers, he relies on extreme concentration to expose the sabotage conspiracy and successfully preserves the whole village's harvest. When capital attempts to monopolize the technology with a ten-million-dollar sky-high contract, Lin Shi resolutely chooses to make the blueprints freely available. Can this pair of hands that once precisely moved the hairspring completely overcome the shadow and collide with heavy machinery to create a brand new hardcore miracle? All the answers will be revealed in the roar of the engine.