College student Jiang Che returns to his hometown to develop aquaculture, but he is misunderstood by the villagers and abandoned by his girlfriend. Rather than leaving, he takes a risk and develops an underground cold spring in an abandoned mine pit behind the mountain, raising high-quality cold-spring fish. Through his expertise and integrity, Jiang Che wins over the market and leads the villagers out of contract traps. Together, they build a cold-spring aquaculture demonstration base and establish distribution channels through restaurants, supermarkets, and e-commerce. Turning an abandoned pit into an industry and green mountains into mountains of gold, he brings dividends to the entire village, gets roads repaired, builds a village clinic, and creates a path toward rural revitalization and shared prosperity.