Sweet Dreams, a Memory of Lovesickness

The mermaid tribe has been in charge of the waters of the four seas for generations, guarding the hollow in the center of the sea to prevent the collapse of the hollow barrier and the collapse of the world. And it has been hundreds of thousands of years since the ancestor sealed it. The barrier has gradually loosened, the spiritual treasure Mermaid Tears that suppressed the barrier has been lost, and the world is about to face a catastrophe. The mermaid princess Huanqi enters the immortal world to practice, and has experienced a lot of troubles in the human world. Can she stop the fate of annihilation?