Jin Ae is type of girl na gagawin ang lahat, masunod lamang ang gusto niya. Kaya nang malaman ng dalaga na balak siyang ipakasal ng kaniyang ama sa lalaking hindi niya kilala ay kaagad siyang tumakas at tinakbuhan ang kaniyang mapapangasawa. But when she met him, whose name symbolizes darkness, she realized that no matter how hard she tried to flee, she was doomed to suffer for the rest of her life, as she was kidnapped and asked to give birth to a child in exchange for her freedom.

"You were mine from the moment you sold your soul to me. Even if you run away again, I will pursue you even into the depths of the abyss," -Zachary Grey Sullivan, who has never desired anything in his life, now finds himself obsessively desiring someone. In his attempt to end the marriage he was forced to, he met Selena Ariadne Morelli, an alluring yet dangerously gorgeous woman who awakens his passionate but destructive twisted desire lying deep within his soul. Bound by a twist of fate, they enter into a contractual relationship affair to break a holy promise. But, as soon as the contract ends, Seia, his cherished mistress, vanishes, never to be seen again. Will Zachary be able to find his runaway mistress? What if her existence had never existed? Will his deviant affection fade, or will it grow more dangerous and twisted?