After his father and elder brother both die in a maritime disaster, Jiang Chao, a young fisherman from a fishing village, is left to depend on his sister-in-law, Jiang Yue. His uncle, Jiang Fuhai, covets the fishing boat and old family house purchased with the Jiang family's money. Using the excuse that the boat's registration is temporarily under his own name, he joins forces with his son, Jiang Zhipeng, to trick Jiang Chao into going out to sea. During a storm, they cut his safety rope and abandon him in the ocean. At the brink of death, Jiang Chao saves a giant tiger shark gravely wounded by steel cables and unexpectedly activates the Sea Beast Attribute Enhancement System. From then on, he relies on tiger sharks to locate fish and provide protection, moray eels to explore reefs, octopuses to dive deep and salvage treasures, and killer whales to surround and catch schools of fish. Every fishing trip brings in an overflowing net and enormous profits. Not only does he give his sister-in-law a peaceful and comfortable life, but he also gradually reclaims all the family's property, leaving his murderous uncle and cousin with nothing to rely on.