In the mysterious depths of the underwater world, the ancient mermaid clan was once the beloved darling of the ocean. However, they were struck by a sudden catastrophe as dark forces surged in. After a brutal war, countless members of the mermaid clan were killed or wounded, and their former prosperity vanished. Now, only five brothers remain, and their entire race stands on the brink of extinction. Desperate to find a way to survive, the five brothers accidentally discover an ancient legend: only by finding a descendant of Nuwa and obtaining her mysterious power can they save the mermaid clan. To ensure the survival of their race, they resolutely embark on a perilous journey into the unknown to seek help. From that moment on, the wheels of fate begin to turn.