Reborn and Teaming Up With My Nemesis!

Olive Marsh and Raina Pace spend their whole lives at court working against each other over which of them will hold rank as empress dowager, and on the day the emperor formally takes power he settles it by taking the rank off both. He names an elderly palace maid as his birth mother and has the two women give their positions up to her. Olive raised him herself and only now finds out he is an impostor, and that he wants her dead as well as out. Raina treats the announcement as a joke and is handed a cup of poisoned wine. The two of them wake up in the period before the accession with all of it still in memory. They put aside what they held against each other and set about turning the Great Heaven Dynasty over, starting with the wording of the decree that would put the impostor on the throne.