Lin Jianguo, a retired senior plumbing and electrical technician, is tricked by his daughter-in-law, Zhao Manman, with a promise of a 30% profit share. After working tirelessly without a single day off for an entire year, he receives nothing but discarded electrical wires. Furious, he decides to strike out on his own and starts a business with an old friend. With forty years of craftsmanship, he becomes Jiangcheng's go-to emergency repair expert. When Zhao Manman spreads rumors and sabotages his business, and a hotel construction accident threatens his reputation, Lin Jianguo turns the tables through his integrity and technical expertise. In the end, those who betrayed him pay the price, and the retired man's life takes on a new meaning.