Lin Wei, a top forensic doctor and criminal psychology expert in the 21st century, accidentally traveled to the Hongwu period of the Ming Dynasty and possessed the body of an orphan girl who was sentenced to exile due to an unjust case against her family. With professional knowledge and tenacity that surpassed the times, she started as an assistant to a widow in a border town, solved strange cases repeatedly, and gradually became involved in the court situation. In the end, she not only wanted to vindicate her original family, but also used the spirit of modern rule of law to shake the strict barriers of the feudal era.