HELP ME FIND THIS MANHWA

Im looking for a manhwa where the female lead regressed to undo her wrongdoings to a prince who is like a shadow beast, she set him free but like when took the position of the emperor he got her on captive and she can like go to others peoples dream, on like the last few chapters i remember she entered a dream with a red hair guy, and shes like a daughter of a children of the night thingy. White hair female if i remember correctly.