Sae Hwa (Sim Cheong)'s cousin, Serene, has her first journey on the land. Even though the sea has shown her nothing but love, she still doesn't find it enough. She wants to find the meaning of true love. And she wants to discover it on land. Serene has always thought her life as a fairytale. Just like how the Ariel, the little mermaid, met the Prince and how they fell in love with each other. Will she find the love of her life? Or will she die when she finally reaches her time limit?