Gu Kai, an all-powerful genius, is a useless person. In an accident, he was dressed as the fake daughter of a wealthy family whose engagement was broken off, and was kicked out and thrown into a remote mountain village. People here speak a completely unintelligible dialect, and he even relies on signs to buy steamed buns. There is a group of Mandarin-speaking "alice friends" lurking in the village - in fact, they are masters of martial arts who are trying to avoid being hunted. Gu Kai, who didn't understand the language, became a "harmless useless person" in their eyes and was dragged into working as an errand boy. Until one night, the enemy came to destroy the whole family, and all the masters were seriously injured and dying. Gu Kai yawned and used the "joint skills" and "pharmacological knowledge" he learned casually in the decathlon to unload the villain boss and throw him into the manure pit. All the experts were stunned: "Who are you?" Gu Kai thought seriously for three seconds: "A... Passerby who can't take care of himself."