According to legend, mermaids are a clan that can bring good luck to the sea. They have fought for the kingdoms of the sea for thousands of years. However, a mysterious disaster three hundred years ago almost wiped out this clan. Three hundred years later, as one of the few descendants of this family, a little mermaid went through ups and downs on the road to pursuing freedom and happiness, but remained indomitable. Heaven and earth, gods and ghosts, and the vast sky, let us accompany her from the sea to the land, from the human world to the demon world, flowers bloom and fade, origins and demise, step by step from ignorance to maturity.