Overworked and always exhausted from social life, Sea-Ah, an entertainment company employee, has only one hobby: fishing. One day, she jokingly thinks, *"I wish I could just get stranded on a deserted island and fish alone forever!"*—and the wish comes true! Though initially panicked, she assumes the others she was with will report her missing, and with a surprisingly carefree attitude, she starts fishing on the island... Feeling the weight of a big catch, she gets excited—only to find she’s caught not a fish, but a *person*... no, a *mermaid*?! Now, she’s stuck on a deserted island sharing space with a mermaid in a very awkward cohabitation. But something about this mermaid… suggests there’s a deeper story behind him...?