During a violent storm, Li Xuefeng of Yuhai Village rescues a female mermaid and receives the power of the Sea God. From then on, he gains extraordinary abilities, including underwater vision, water manipulation, and the power to sense marine treasures. Facing hardships such as his father's serious injuries and coma, as well as extortion by the village bully, he makes a solemn pledge to dive into the deep sea and catch the king of large yellow croakers. The fish is auctioned for millions. At the sea-harvesting competition, he crushes his rivals and claims the championship. He establishes the Tengda Seafood brand, leads the entire village in forming a cooperative, and helps everyone become prosperous. He also falls in love with Shen Yiyi, the president of Tianweilou, and holds a wedding with beluga whales. Meanwhile, foreign capital secretly makes moves to steal the region's marine resources. The female mermaid reappears to warn him. With the national competition approaching, an even greater storm is about to begin.