When a villian fall in love

This is a story about two people who sufered so much in their past. Because of that they became a monsters. Katherine, a young woman from a small country in Europe is hiding in the shadows, alone, running from a immortal psychopath. Kai, a young man treated like an abomination for being defferent. After years of looking for someone to give them love they finally meet each other. Their life will never be the same after the gaze they had. This story is about lovers who can go through the hell to save the other.