Many centuries ago, Tia Kingdom was destroyed, she is the only survivor but she no longer humans, a while back some witch transferred her power to Tia and she became Vampire and the attendants 'Woon' the wizard found her and became her guardian and servant. Wandering the world she came to Korea and became High priest, there she met Prince Caire, a hostage prince from another kingdom, Tia make contract with Prince Caire to give him power, but he had no idea he will became Vampire.
After that Prince Caire back to his country and fought in several war, after a while he realized that he needs blood to survive so he drink blood from the war prisoner, he slaughtered the imperial family and became a tyrant, after he became the Emperor he began to search for Tia, after searching wide and far he encountered Tia in Martin house. but he only recognize Tia by her eyes, he still doubted her cause the Tia that he met was much older than him, so he keep Tia by his side and drank her blood, the more he drank Tia blood, the more he lose his human side but on the other hands Tia would completely became human again.
It turn out after Tia transferring her power to Caire, Tia became teen again and lose her memory, the only thing she remember is someone (Caire) calling her 'Tia', Martin father found her and he knew about her identity so he abused and tortured Tia to make her remember about her past, Martin mother think they are in some BDSM relationship, so she bullied her out of jealousy.

Am I the one who still has no clue what's happening? Just me? Right cool