Zhan Haishan, a middle-aged captain with extraordinary skills in catching king crabs, is begged by his childhood friend Cui Yunchao to come out of retirement and start a business together. They agree to split the profits equally. Over the following year, Zhan Haishan risks his life at sea and generates nearly ten million yuan in revenue for his friend's company, only to receive a measly 50,000 yuan bonus. Furious and deeply disappointed, Zhan Haishan finally decides, with the support of his wife Wang Huanjun, to break away from his childhood friend, buy his own boat, and go fishing independently. With his courage and exceptional skills, he eventually becomes a legendary king crab fisherman in Jiangcheng.