Shut Up! so What If You Are a Substitute?

I am the emperor's favorite princess and the only princess in this dynasty, but I am regarded by the prince as a substitute for the girl from a small family. The real master appears, and I, the noble princess, are actually forced to accept an equal wife and stay alone in the empty house. Is it an equal wife? Haha, those who follow me will prosper, and those who go against me will perish. Besides... It's still unclear who the substitute will be. Enjoy it, my dead husband! ! !