The Archduke's Fabulous Fake Marriage

I possessed the body of the fourth villainess, Shay, who was miserably killed by the other villains for desperately clinging to the male lead. However, the male lead suddenly offered me an enormous amount of money, in exchange for a contract marriage to help him escape various romantic advances. "You have to be the most gorgeous and wicked woman in the empire, so that no one will dare to approach me." ...Isn't this marriage a fraud? Was what I was going to say, but the amount of money he offered was too tempting to refuse. Alright, before the original female lead appears, I'll show them who's the crazy bitch here. "Dear customer, I'll do my best to help you!" I was confident this was the original plan, however... This man, whose affection and warmth know no bounds, said he can't imagine a life without me! I think I somehow ended up getting money, power and even love!