Li Jianjun, a middle-aged man laid off from a state-owned enterprise, worked as a treasury manager in a private enterprise to make a living, but was despised by his bosses and technical experts because of his background. Unexpectedly, the company's millions-worth of imported precision machine tools suddenly broke down. Experts were helpless and the factory came to a standstill. Li Jianjun stepped forward and successfully repaired the machine tool with his exquisite skills that he had honed for many years, which slapped everyone in the face. He also took advantage of this counterattack, regained his craftsmanship, kept his craftsmanship and dignity, and became a truly great craftsman.