My Ex Watched His Uncle Mark Me

After fallen noble heiress Selena is betrayed and humiliated by her fiancé, she turns around and knocks on the door of her fiancé's own uncle. Using her body as bait, she entangles herself with this ruler of the empire right under her fiancé's nose. Plotting every move with careful calculation, she eventually tames this towering, arrogant demon and is lifted to the very pinnacle of power.