Shut Up! So What If You're a Substitute?

I am the emperor’s most beloved princess, and the only princess in the dynasty. Yet the heir treated me as a substitute for a woman from a humble family. When the original returned, I, a princess of the realm, was forced to accept her as a co-wife and left alone in an empty chamber. A co-wife? Ha! Those who obey me prosper; those who defy me perish. Besides... it remains to be seen who the substitute really is. Enjoy yourself, my dear late husband!!!