Li Feng goes out to sea to fish with his eldest uncle, Li Dahai, and second uncle, Li Dajiang. They unexpectedly catch a 500-jin bluefin tuna. Hoping to use the money to pay for his sick younger sister's treatment, Li Feng is betrayed by his greedy relatives, beaten, and abandoned on the reefs of Black Reef Island to die. At death's door, his filial devotion moves the Dragon Maiden, who bestows upon him the Divine Dragon inheritance. His injuries heal, and he gains extraordinary abilities to sense the ocean and dive at high speed to catch fish. Having miraculously survived, Li Feng returns and foils his uncles' scheme to seize his family's property. He meets Su Ruoxue, the proprietress of Haiyan Restaurant, and earns enough by catching rare seafood to cover his sister's surgery and postoperative special medication.