Cheng Zhu is the only master mechanic at Iron Bull Precision Repair Shop capable of repairing imported engines. After eight years of working himself to the bone and keeping the entire shop afloat, he earns a mere 4,500 yuan a month. When his father suffers a workplace injury, the company refuses to cover his compensation, while the boss, Zhang Tieniu, repeatedly humiliates him. Furious, Cheng Zhu quits on the spot and starts his own business, Xuefeng Precision Repair. But Zhang Tieniu cuts off his entire city's supply channels and sends violent thugs to wreck his workshop. Armed with extraordinary skills, including diagnosing machinery through sound alone and performing emergency cylinder welding at high speeds, Cheng Zhu makes a legendary name for himself and earns the admiration of Sixth Master Liu of the National Highway. Eventually, he exposes Zhang Tieniu's criminal schemes and sends him to prison. He goes on to establish Xuefeng Heavy Industries, finally fulfilling his promise to buy his wife the finest shoes in the world.