After Rebirth, the Queen and the Concubine Join Forces to Slay the Dragon

In my previous life, I fought to the death with the imperial concubine. After her death, the emperor immediately named the imperial concubine Shu as his queen and made her son the heir apparent. We were shocked to realize that we were all pawns used by the emperor to protect Concubine Shu, and we had been serving as a shield for Concubine Shu for many years! When I open my eyes again, I go back to the day when the imperial concubine snatched my cat. The imperial concubine suddenly let go of her hand in fear: "This cat... How is it still alive?!" I knew that she must have been reborn. In this case, no one who caused our tragic death will have an easy time!