He was transformed into a white-haired, red-eyed woman for studying forbidden knowledge.
The pollution of immortality, the curse of eternal life, flesh and blood being eroded.
Even "death" became a luxury. Transformed into an immortal being, she never knew when she might become a mindless monster of flesh and blood.
In a daze, she searched for a solution until she met a man, a strange man known as the Demon Duke.
He survived by devouring flesh and blood polluted by immortality, and was also "one of the cursed."
They struck a deal: she would provide him with "food" regularly in exchange for the "Philosopher's Stone" he might be able to create. Then she would slowly wait for an opportunity to take over his body and free herself from the pollution of immortality once and for all.
But she underestimated this man, who was a true demon, and his desires, whether for food or for other things...
After her intentions were exposed, she was imprisoned in a mansion somewhere, asked every day for fresh flesh and blood, and forced to endure his nearly twisted possessiveness.
They depended on each other. As long as she was alive, the man could survive on her flesh and blood, while his ducal title could provide them with a life of eternal comfort. It was clearly a beautiful fairy tale.
But the man did not know whether these feelings were love, or merely the effects of the curse.
But she absolutely despised it: this life of being kept in captivity, treated as food to be carved up at will, and regarded as a lowly slave.