Chen Haisheng worked alongside his older brother, Chen Haifu, making money by fishing along the coast. However, when it came time to split their earnings, his brother and sister-in-law turned against him, dismissing him with just 2,000 yuan while eyeing his homestead. During a fishing trip, Chen Haisheng was unexpectedly possessed by a divine dragon and obtained a Dragon Pill, becoming the Dragon King of the Sea in the modern world. Not only can he breathe freely underwater, but he can also sense and communicate with schools of fish. Heartbroken by his family's betrayal, he decides to strike out on his own with his childhood friend, Zhou Tiezhu. They catch huge quantities of fish and discover underwater treasures, earning an enormous fortune and leading his wife and children toward a prosperous life.