
The daughter of the Grand Physician Bureau's chief official, Su Yan, finds her family brutally exterminated overnight on her wedding night. When she awakens, she has become a widow with a toddler constantly following her calling for 'Ma...'.
In search of the truth behind the Su family's massacre, Su Yan heads to Chang'an. To enter the Dali Temple, she disguises herself as a man and works undercover as a forensic examiner, only to get involved in a series of brutal murders targeting courtesans, which peels back the layers of the truth behind her family's demise.
Chang'an is filled with treacherous winds and dark clouds gathering. Is it the wickedness of human hearts or the cycle of cause and effect? A cursed village and the disappearing murderer... all these lead Su Yan step by step in her investigation of the truth.
The cases are perplexing and confusing, while human hearts are unfathomable and hard to judge. As the night banquet approaches, what demons and ghosts are hidden behind it all? Watch as forensic examiner Su Yan teams up with her irascible superior to dispel the clouds and fog, unraveling one mystery after another.