Legend of the Sea (2007)

The Eastern Sea has been peaceful under the reign of the Dragon King. That's about to change, when the evil octopus Ocho is freed from her banishment and unleashes her vengeance upon the kingdom. Draco, the prince, is the only one who knows of her plans and leaps into action to stop her. Only through fighting for what he believes and protecting those he loves, he realizes what it truly means to be a Dragon King.