On the eve of the wedding, the Fu family's legitimate daughter disappeared mysteriously. In order to keep the family intact, the Fu family had to let their concubine Fu Xiao disguise herself and marry into the notorious Zhenye Hou Mansion. In the eyes of outsiders, he is a docile and tolerant "bride of the Fu family" who can't be bullied. In fact, he is cold and restrained, cruel and steady. He is best at hiding the knife in his sleeve and hiding his words in his heart. What's even more bizarre is that Fu Xiao got an ancient rare treasure "a thousand-faced bone mirror" in the sedan chair. He can use blood to open the mirror and reflect the afterimage of the incense stick before the death of the deceased. It can also temporarily imprint other people's voices, breaths and habits to create different walking situations. From then on, he was the bride of the Hou Mansion during the day, a man in black investigating the case at night, and secretly turned into a businessman, a doctor, a death row prisoner, and a retainer, uncovering the truth about the serial murders in the Hou Mansion layer by layer. But as the clues deepened, Fu Xiao discovered that with every layer of vest he wore, there was another mysterious force that was fighting with him in the dark, snatching clues, destroying evidence, and using his identity to reverse the plot. That man is not only a murderer hidden deep in the Hou Mansion, but also a person who is better at acting than him. The substitute marriage is false, but the killing is true; the investigation is false, but the trial is true. After all the identities were killed, Fu Xiao realized that this marriage was a cage tailor-made for him by the murderer from the beginning.
