Lin Fan, a retired soldier who once made his enemies fearful, returns to the city with a mysterious high-level martial arts system. She originally wanted to live a low-key life, but due to an accident, she met the tragic but strong twin sisters Hua Linxi and Lin Yue. His "good friend" who was jealous of him in the past was behind his back, his enemies from his previous life were pressing closer, and the green tea bitch was plotting secretly. Faced with many crises, Lin Fan no longer hid, activated the system to upgrade and fight monsters, and relied on his incredible strength to pretend to be a pig and eat the tiger, and made a comeback. He protects his sisters with a chivalrous heart, clears obstacles with domineering methods, rises from the bottom of the city, changes his fate against the odds, and eventually becomes an invincible legend in the urban martial arts world!