Lin Yu, the technical director of Jincheng Technology, is framed by sales director Zhao Kai, who maliciously installs a backdoor in the system, causing a project to collapse and Lin Yu to be fired. After a water leak in his home leads him to meet Master Liu, a repairman, Lin Yu is deeply inspired by his craftsmanship and principles of integrity. He establishes Yu'an Technology, starting with small property management contracts and building a reputation through stable, efficient systems. He successfully wins a bidding competition for a Huaxing Real Estate project and presents complete evidence exposing Zhao Kai's conspiracy. By valuing talented people, accepting a repentant former rival, and establishing a fund to protect repair workers' rights, he combines software technology with blue-collar craftsmanship and leads his company to become an industry benchmark, always remaining true to his original mission of using technology to serve ordinary people.