A female PhD in forensic psychology traveled back to the Republic of China. In an era when shadowless lights and microscopes did not exist, she relied on "memory hearing of the deceased" and micro-expression psychology to solve crimes. This is not a simple detective from the Republic of China, but a sober and cold-blooded intellectual woman who uses science and supernatural abilities to tear apart all the lies in an old era where patriarchy is rampant and superstition is rampant. She "speaks" for the dead while investigating the mystery of her father's disappearance.