Sae-ah’s only hobby—amid her exhausting life as an overworked employee at an entertainment agency and a packed social schedule—is fishing. “I wish I could get stranded on a deserted island and spend the rest of my life fishing in peace!” she thinks, picking up her fishing rod once again… and somehow, her wish comes true! At first, she panics, but soon calms down, convinced that the people she was with will report her missing. With that carefree mindset, she starts fishing even on the deserted island... She feels a strong tug—surely it’s a big catch!—and gets excited. But what she reels in isn’t a fish... it’s a person?! A merman?! Suddenly, she’s forced into an awkward cohabitation with a merman on the deserted island... and for some reason, this merman seems to be hiding a deep story. What could it be?