In the 1990s, rural young man Chen Shugen desperately needs money to treat his critically ill father. He begs his greedy second uncle, Chen Erzhu, for a loan, but is coldly refused. Just when all hope seems lost, the family's old dog, Da Huang, suddenly speaks up to help. It turns out that Da Huang is a hidden Demon Emperor. Following his guidance, Shugen digs up a thousand-year-old mountain ginseng to save his father. Da Huang then continues to guide him in reclaiming wasteland to grow watermelons, reviving an abandoned fishpond for fish farming, building a chicken farm, and planting fruit trees, leading the villagers step by step out of poverty and toward prosperity. The greedy and ruthless Wang Fugui repeatedly teams up with Chen Erzhu, resorting to underhanded schemes such as poisoning, destroying farmland, blocking roads, and kidnapping to sabotage their efforts. Da Huang repeatedly uses his supernatural powers to overcome every crisis and punish the villains. In the end, Wang Fugui's crimes are exposed and he is sent to prison, while Chen Erzhu finally comes to his senses, repents, and turns over a new leaf.