It tells the story of Wen Qingning, daughter of the former Jingzhao Yin, who comes to Chang'an to find out the truth behind her father's bizarre death, resolutely tears up her engagement, and becomes a female coroner of the Jingzhao Prefecture. She gets to know Wu'an Marquis Shen Junxing. The two join hands to crack multiple bizarre murder cases, follow the clues to dispel layers of heavy fog, uncover a huge conspiracy of the privileged group, clear their relatives of false accusations, uphold legal principles and their original intentions, and also reap sincere affection.