Lin Chuan, a young man from a fishing village, is plotted against and thrown into the sea by his cousin. By chance, he saves Ao Xi, a dragoness undergoing her heavenly tribulation, and gains the ability to command ten thousand fish. Facing the evil deeds of capital groups overfishing the ocean dry, he holds fast to the ecological bottom line, unites the fishermen, and rejects predatory fishing. The two join hands to protect marine resources, develop benign fishery, and jointly guard this blue home that nurtures the people.