Yue Ling, the koi fish from Yaochi, transforms into the little mermaid who is loved by the four male protagonists in the novel. The passage to return home will only be opened when the four male protagonists' favorability value for the little mermaid reaches 100. In order to survive until the end and return home smoothly, she had to fight wits and courage with the four male protagonists. The little mermaid, who originally thought that she could go home smoothly after passing the level, actually took the initiative to one of the men while getting along.
