You didn't expect to get hit by a truck. You definitely didn't expect yourself to wake up in a novel that you've read. You ended up in the body of the villainess's twin.

In the novel after joining the emperor's harem the villainess harassed her follow concubines and eventually did something that brought death upon her, the only issue is she got her family killed with her. And the biggest plot twist was the fact that the villainess was the only female member of the harem! How will you survive?