A modern female military doctor transmigrates into the body of a discarded daughter of a military family, only to find the coffin lid sealed shut at the very start. With a scalpel in her left hand to save lives and a Gatling gun in her right to slay enemies, she also showers the sickly, scheming Ninth Prince with affection, bringing him all the way back from the gates of death to the side of the imperial throne. When the Emperor's decree granting marriage between the Ninth Prince and the Xie family's legitimate daughter arrives, Ouyang Hengshuo removes the mask he has worn for half the drama, bends down, and smiles. "Qianqian, there's no need to pretend anymore this time. The three betrothal letters, six wedding rites, and ten miles of bridal gifts—none of them will be missing." On their wedding night, she goes from being his bride to becoming his strongest armor.