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At the age of 12, when he experienced his first difficulty in breathing, Kai realized he was a merman from that day onward. Despite avoiding love due to the emergence of scales at the touch of a woman’s hand, Kai lives a resilient life as a self-imposed loner and he chooses to never date while facing loneliness and sadness. Suddenly, a mysterious woman named Yana appears before him! Whenever Yana is around, Kai unintentionally loses his restraint and his body responds involuntarily. But what should he do? Even when it feels suffocating, he finds himself liking her...! A breathless romance unfolds between a man who transforms into a merman with just a touch of his fingertips and a woman who wants to touch his hand.
Yana Jeong, a typical girl, runs into a strange man who's out of breath during one of her part-time jobs. Little did she know that this was Kai Shim, the son of the CEO of a large jewelry corporation called Inoroo, who also happens to be a merman. Yana coincidentally runs in Kai again when she ends up working as a waitress at his birthday party, where a series of accidents lead to the two of them meeting each other again. Will Yana be able to keep up with these unexpected events happening one after another?