Shen Yanqiu, a female welder at Jiangnan Heavy Industries, has spent twenty-five years steadfastly working on the front lines. For a deep-sea project, she independently completed all the critical weld samples, only to have her apprentice take credit for her work. She was humiliated and fired by the general manager. On the very day she left the factory, the automated production line suffered a catastrophic collapse in its qualification rate. The chairman of Taiyue recognized her talent. After she achieved zero defects in a welding test, he hired her on the spot as Technical Director. When her former company came to poach her, she exposed their deception. They then spent a fortune poaching her younger brother and stealing her twenty-five years of welding notes, causing their project to fail. At a skills competition, an authority figure revealed her past as a zero-defect welder. She proved her abilities by producing a flawless weld, while those who had stolen her work were held legally accountable.