We rejoin our friend the merchant as he returns home from his adventure with the King of Birds. When curiosity gets the best of him and he opens his new mysterious golden chest, the merchant unwittingly condemns his newborn son to a life under the sea. His son grows up to be adventurous and strong, and when he goes to the sea to serve the Water Spirit, he befriends Tyna, the Water Spirit's daughter, who promises to help him. Will Tyna save the merchant's son from her vengeful father?