This type of novel was more commonly known as " mermaid novels " or " mermaid novels." The following is a plot summary of a mermaid novel that might meet your requirements: The protagonist was a mermaid named Little Shou. Before he was reborn, he was captured as a mermaid slave and suffered all kinds of unfair treatment. Xiao Gong was the prince of the Mermaid Kingdom. He had always had a good impression of Xiao Shou, but because of his identity and status, the two of them could not be together. In an accident, Lil Shou obtained the ability to revive. He discovered that he could leave the mermaid's body and return to the human world. After returning to the human world, Lil Shou decided to take revenge on the Mermaid Kingdom and looked for Lil Offo to bring him back to the Mermaid Kingdom. In the process, the two of them experienced many difficulties and challenges, but in the end, they overcame all the obstacles and successfully achieved their goals. At the end of the novel, the two finally got together and lived happily together, and the relationship between mermaids and humans improved.