Leucothea was a human queen in a strong country Husumia until once the duke betrayed her king , sold out the whole empire and fooled her people. After her family all was died, she was forced to a sentencing by jumping down to the sea. She was dead unpeacefully, but the vengeful spirit brings her came alive again as the rage from bottom of the sea, to retrieve her honor, her empire. The revenge from the Thalassa.