During the Ming Dynasty, the chief of the fleet, Yang Lie, led the fleet to travel secretly to the East Sea. In the stormy situation, while being attacked by the Sea Dragon, they were rescued by Xi Yin and brought to her home, the dream-like Penglai Xian Island. Yang Lie was fascinated by the treasures of the island, and after a while, the stern man and the kind and innocent mermaid Xi Yin slowly started developing feelings for each other while confronting the dark forces that threatened the island.