Modern forensic pathologist Su Qingyue opens her eyes to find herself in ancient times, now the despised legitimate daughter of the Marquis of Zhenbei's household. Accused of poisoning Prince Jing's fiancee, Xiao Jue, she has been dragged into court and stands on the brink of death. Her former self was obsessively infatuated and notorious for her misdeeds, and the eyewitness and material evidence seem conclusive. To win a chance at survival, she points out a baffling flaw in court and makes a deadly pact with Xiao Jue, who hates her to the core: she has ten days to solve the case while under suspicion. If she fails, she will be executed by slow slicing.
Forced together, the two take one perilous step after another into a deep pool of conspiracies. She ignores taboos and examines the corpses and traces, using precise modern forensic science to overturn every established conclusion. He watches with cold eyes, but her composure and expertise gradually set his gaze ablaze. Yet the true culprit lurks like a shadow, and every clue that emerges brings an even deeper frame-up and more bloodshed. Then, during a midnight ambush, Xiao Jue takes a strange poison while protecting her, leaving his life hanging by a thread. In despair, she reveals her deepest secret: “I'm not her... I come from a world where the dead can speak.”