Fisherman Gu Haichuan encountered a crisis at the cliff, only to have his biological son, Gu Zi'ang, heartlessly cut the rope to seize treasures and plunge him into the deep sea. By chance, he gained a special opportunity, enabling him to survive underwater and understand the language of the creatures in the sea. Relying on this miraculous encounter, Gu Haichuan harvested many rare seafoods and gained a considerable income at the fishing port. Facing his son's continuous entanglement and scheming, he severed the father-son bond, adhered to his original intention, and teamed up with the upright Shen Zhilan to start his brand-new life above the vast sea.