During the Yongle period, strange things happened frequently in Yingtian Mansion. First, a wealthy businessman died mysteriously in a secret room with half a rouge button in his hand. Later, embroidery ladies from embroidery workshops disappeared one after another, leaving only strange bloody embroidery threads on the scene. Lu Zhao, the cold and taciturn but capable of solving cases like a god, wants to investigate the truth alone, but unexpectedly meets Su Wan, an eccentric embroiderer who is good at finding clues from the details of embroidery. One intimidates Xiaoxiao with his embroidered spring knife, and the other solves the puzzle with his delicate mind like a rouge button. The two have gradually grown from "happy enemies" who dislike each other to a tacit understanding of crime-solving partners. As the investigation deepened, they discovered that behind these cases there was actually a huge conspiracy involving secret treasures in the world, and Su Wan's father, who had been missing for many years, seemed to be related to the matter. Faced with heavy fog, deadly traps and enemies hiding in the dark, can Lu Zhao and Su Wan find the real murderer? Can they protect each other in the face of danger and uncover the ultimate secret?
