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...?