In 1985, Song Zhiming, a talented electric motor engineer, unexpectedly travels back in time after his life's work in motor research and development was stolen by others in his previous life, leaving him with nothing but regret. Given a second chance, all he wants is to faithfully protect Yongxing Electric Motor Factory. However, Yang Xuemei, the factory director's daughter, also carries memories of her past life. Having mistakenly placed her trust in Sun Xuejun, an opportunist who does nothing but scheme, she insists on dismissing the hardworking Song Zhiming. At his most desperate moment, Zhou Ting, the head of a rival factory, recognizes his outstanding technical expertise and offers him a partnership. Relying on his advanced knowledge and dedicating himself to research, Song Zhiming develops a new generation of high-quality electric motors. His career flourishes, and he also finds a sincere love that is reciprocated. Meanwhile, Yang Xuemei, having misjudged the people around her, is left with nothing but endless regret.