They say that the waters of the Eastern Seas are cursed. The sailors talk of sirens, luring sea folk to their death with their melodious voices. Hongbin never considered these stories more than old wives' tales. And he'd never thought they would form the basis of his sea adventures.

Deeper, in the heart of Eastern Seas, Yeonhee never thought she would ever get to leave the dark towers that imprisoned her. But destiny has more in store for the two.