Qin Lie, once a top-tier fighter, has concealed his identity and quietly handled odd jobs at a boxing gym, living a low-key life. Usually quiet and hardworking, he only steps in to help when others are in trouble, and his extraordinary skills gradually become known to everyone. His junior fellow apprentice, who had been missing for three years, comes looking for him and brings old events to light, revealing that many hidden circumstances lay behind what happened back then. No longer avoiding his past, Qin Lie gathers clues to uncover the truth. In the end, he lets go of the knot in his heart, takes over the boxing gym, and devotes himself to teaching boxing, completing his inner transformation and growth as he protects others.