On his last day before retirement, veteran electrician Yang Guofu discovers his apprentice Ma Tao’s reckless shortcuts, which cause a factory-wide power grid collapse. Falsely accused and forced into retirement, Yang struggles to clear his name. Post-retirement, he accidentally helps Qingshan Group solve a power grid problem that stumps even foreign experts. His success earns him a lucrative rehire and global recognition, with companies vying for his patents.