After Ran Yan’s post-mortem examination, she found that the four bodies were missing and turned into rotting corpses overnight. However, the deadly weapon was not found. The local Li Xianzhang and the arrest of Zhu Qi could not be found. So Ran Yan took Xiao Song to Master Wu Xiuhe’s courtyard to conduct various murder weapon experiments. Xiao Song learned from Wu Xiuhe’s mouth that Ran Yan had studied Wu Xiuhe’s autopsy skills since she was a child. She is determined and talented, which makes Xiao Song appreciate it more. After drinking, Ran Yan had to take off his clothes and perform an autopsy, which scared Wu Xiu and the rat to flee. Xiao Song, who was unknown, was deeply affected. During the quarrel between Ran Xiao and Ran Xiao, Ran Yan thought of the time of death of the corpse by vomiting.