Looking for a shoujo

I'm looking for a manhwa that the main character has two sisters a younger and older one and their father is a gambler and gambled to much so he lost his house and left with the money he had and let his daughters. The eldest one married rich and left the other ones and the middle child (main character) was killed and went back in time because she was deceived and branded a mistress. The male lead is the head of the gambling office and he is supposed to be king? Or maybe a Duke? I forget but he has to either kill his whole family or marry someone out of love to get his title and the girl (female lead) tells him this and he chose to marry her cause she said that she doesn't want to ever get married (cause she was abused physically and mentally by the guy who made her his mistress. She didn't know he had a fiancee btw)


If anyone knows this please let me know cause I've been looking for it for almost 2 months now.