Chen Lang, a young man down on his luck, returns to Caogang Fishing Village. Armed with the extraordinary sea-listening skill his grandfather taught him and a secret nautical chart, he builds his livelihood by harvesting seafood from the reefs and gradually uncovers the dragon veins of the deep-sea fishing grounds. Seafood tycoon Zhou Defa inherits the family business and launches an all-out campaign to crush him through supply cutoffs, ship sabotage, covert interference, and legal tactics. Chen Lang fights back alongside Lin Wan, a seafood shop owner, Uncle Zheng, an old fisherman, and his cousin Chen Hu. They discover giant rare fish and the ruins of a sunken ship in Fish Ancestor Cave, paving the way for the establishment of a national marine protected area. Zhou Defa is brought to justice, Chen Lang's grandfather's name is engraved on a memorial stele, and Chen Lang leads a cooperative of thirty fishing boats, helping the villagers set sail for a better future in the open sea.