Five years after a laboratory explosion, Shen Lie was forced to fake his death and go overseas, while his wife Su Wan single-handedly raised their daughter with a leg ailment and persevered in developing bionic exoskeleton technology. Five years later, Shen Lie returned in secret, guarding his wife and daughter in the identity of a security guard, and the two together defeated the conspiracy of capital and evil forces. His wrongful grievances were finally vindicated, the technology was successfully implemented to benefit people with disabilities, and the family of three welcomed a happy ending.