Katarina Claes, the eight-year-old daughter of a duke, recovered her past memories when she was hit on the head by a rock. In a feverish nightmare, in which the prince's fiancee was determined, she realized that this exactly like an otome game from her previous life.
So, she has turned into a villain that interferes with the romance of capture targets — if the heroine gets a happy end, Katarina would be exiled; but if the heroine gets a bad end, Katarina would be killed.
With no happy ending waiting for her at the end of the road, Katarina somehow has to avoid destruction and reach old age peacefully!