Modern forensic doctor Shen Qingyan transmigrates as the abandoned wife of the Marquis of Ningyuan, and upon waking up is secretly harmed and confined by her cousin. That night, she kicks open the bedchamber, a silver hairpin tests that the Marquis is deeply poisoned, and silver needles provide emergency treatment to save him from the gates of death. From then on, the abandoned woman turns the tables, testing poisons and slapping faces, entering the palace to eliminate traitors, and discovering that the poisoner turns out to be the fake emperor on the dragon throne. Holding a bloody decree, she assists the Marquis in leading 300,000 troops to breach the imperial palace to set things right, and finally the two retreat to the border to live and die together.