A popular streamer is mysteriously killed during a late-night broadcast, yet the autopsy report says “natural causes.” An AI painting commits a bizarre murder, but investigators can find no trace at the scene. When modern technology becomes the demons’ “perfect alibi,” only he, an Immortal Emperor who has just fallen into the mortal realm by accident and possessed the body of forensic intern Ji Xuanjun, can see through the truth. Others examine corpses; he examines souls. Others investigate cases; he hunts demons. While the whole world thinks these are high-IQ crimes, he is solving one mystery after another in the morgue with a scalpel! Is it all fate, coincidence, accident, or the work of an even greater mastermind behind the scenes?