On Peach Blossom Island in the 1980s, fisherman Zhao Changchuan is reborn and decisively calls off his marriage arrangement with the greedy and calculating Sun family. He rescues Lin Wanqing, a female educated youth who is in danger, and awakens the Ten Thousand Beasts Pact, granting him the ability to form alliances with marine creatures such as orcas and Chinese white dolphins. Zhao Changchuan goes out to sea to catch rare seafood and make money, while helping treat the serious illness of Lin Wanqing's elder sister, Lin Wanyue. As the two grow closer, they eventually marry. He repeatedly thwarts the Sun family's schemes and the oppression of unscrupulous seafood merchants, insisting on sustainable fishing rather than exhausting the sea's resources. He establishes a fishermen's cooperative and opens up sales channels in the provincial capital. During the Crescent Moon Sea Cave incident, he ventures into danger, defeats the villains, and rescues trapped divers. In the end, Zhao Changchuan protects his family and the ocean, leads the islanders to prosperity, and becomes a legendary fishing king.