A young mermaid, Dyesebel (Anne Curtis), takes on a journey to trace her origins until she finds out that she is the daughter of a merman and a human. Disowned by the sea for being the child of Tino (Albert Martinez) who was the prince of the sea and the human Lucia (Dawn Zulueta), she starts with her adventure and explores the human world where she will meet Fredo (Gerald Anderson). But this journey will be marked by a realization that she is not accepted by both worlds. And as a war between man and the underworld appears imminent, Dyesebel will choose to leave those that she loves. Pagkatapos ng lahat ng kaniyang sakripisyo, mahahanap ba niya ang tunay na kaligayahan?