All six main spindles fail inspection. Zhou Zhendong, a Level 8 fitter with twenty-three years of experience, is unexpectedly forced to sign a statement accepting responsibility. Faced with procurement officials who secretly replaced the bearings and managers eager to shift the blame, he presents his records, takes off his employee badge, and walks out of the factory. Donghe offers him five times his former salary, while failures at Hongxing continue to erupt one after another. From overcoming assembly challenges to training apprentices to work independently, he uses his genuine skills to win back orders and respect. When his former employer comes begging for help, can he stand by his principles? Welding sparks illuminate the frost, revealing the integrity and sense of responsibility of a true craftsman.