Modern youth Lin Mo travels through time into a chaotic world, ending up at the dilapidated Black Wind Stronghold. A smartphone with its own offline AI, Little Bean, is his only reliance. Confronted by formidable enemies demanding skills and corrupt officials framing him, he cleverly uses his wits to resolve desperate situations and obtains a legal salt permit. Not only does he boil salt to foster industry, but he also uses local materials to make cement, building granaries, walls, houses, and expanding roads, step by step transforming the bandit stronghold that everyone feared into a safe, prosperous, and righteous mountain settlement that protects its neighbors.