Modern forensic doctor Shen Qingli travels back in time to the Great Jing dynasty, only to be falsely accused and sent straight to the execution ground upon arrival. Using her professional knowledge of forensic bone examination and toxicology, she exposes the fabricated evidence on the spot and saves herself. Impressed by her abilities, Lu Xiuyuan of the Dali Temple makes an exception and appoints her as the first female forensic coroner. Together, they solve a series of cases, including a bizarre ghost marriage mystery and an old case from the northern frontier, eventually tracing the clues to the assassin organization known as Blood. As they dig deeper, shocking secrets emerge: ten years of military payroll corruption, the murder of the late emperor, and power struggles within the imperial family. Ultimately, the powerful old prince pulling the strings behind the scenes is brought to justice. Shen Qingli establishes an official forensic bureau, using human remains to distinguish good from evil, while Lu Xiuyuan wields his blade to defend justice. Together, they clear countless wrongful convictions and grow from condemned prisoners at the execution ground into a devoted couple who protect peace throughout the land.