Zhang Jingchuan, a 61-year-old retired precision technician, is begged by his nephew Zhang Chenghu to come out of retirement and save his factory. His nephew promises him a 30% share of the profits. Zhang Jingchuan uses his exceptional skills to turn the factory around, bringing in tens of millions in annual revenue, only for his nephew to go back on his word, pay him a mere 8,000 yuan, humiliate him, and fire him. Zhang Jingchuan mortgages his home to start his own business and partners with Director Yu to establish a factory. His ultra-high-precision technology wins contracts worth tens of millions, making him an industry leader. Meanwhile, Zhang Chenghu's factory quickly collapses after losing its core technology, and he arrives with his family to beg for help. With a clear sense of justice and grievances, Zhang Jingchuan ultimately stages a triumphant comeback.