The chief female forensic doctor of the 21st century, Shen Jingzhe, traveled through time and became a ninth-grade female jailer at the Dali Temple in the Ming Dynasty. She was framed for poisoning Princess Hui and was imprisoned just after time travel. Her father was also implicated and imprisoned. When she was about to be interrogated and executed, she bound to the "Forensic Divination" system and relied on her forensic knowledge to point out the loopholes in the case at the execution ground and postponed execution. She conducted an autopsy at the Dali Temple morgue and confirmed that Princess Hui actually died of suffocation. She also found that the method of the case was consistent with the violent death of the prince ten years ago, and the real culprit behind the scenes was the same person. During the investigation, she met Lu Li, the commander of the Jinyi Guard, and the two joined forces to fight against all forces. They saw through King Zhu Youjian's conspiracy and exposed his crime in the Golden Palace. As a result, Shen Jingzhe was named the sixth-grade "The No. 1 Female Punisher in the World" by the emperor and joined the Jinyi Guard. In the end, she accepted the S-level mission assigned by the emperor. She needed to investigate the theft of firearms from the armory in the south of the city within three months and recover the stolen firearms. Her fate was closely linked to that of Lu Li, and she started a new investigative journey.