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How can a mermaid from the Joseon era survive in modern-day Seoul?
They pretend to not recognize each other, while fighting their attraction for each other.
Finally Yoo-mi admits that she remembers the incident.
Jin-wook asks her the reason why she left him and she replies that it was just a one-night stand. She is very energetic and receives recognition for her work, but her only interest is in CEO Eun Hwan-Ki. So-Rim has fallen in love with Han-Gyul at first sight and has made up her mind to find him and confess to him.
Thanks to her strength, she gets the job of a bodyguard, to a rich heir Ahn Min-hyuk , the CEO of a gaming company, Ainsoft.
Contrary to Guk-doo, Min-hyuk is an odd man who is playful, a little spoiled, has no regard for rules, and dislikes policemen.