Lin Xiyan, the daughter of a wealthy family, was replaced because of her appearance when she was 10 years old, and her parents were framed to death for exposing the "black market in appearance." Using the "shadow pen" left by her mother (which can tattoo other people's faces on the body and imitate voices), she tattooed the enemy's face on her chest and infiltrated the Gu Group as a "substitute". During the process, she developed a sadomasochistic relationship with Gu Jingshen, the heir to the Gu family, only to discover that the other person was his biological brother who had been separated for many years. As the investigation deepens, the body double case of that year involves the "black market of looks" in which the upper class exchanges the faces of innocent people for profit. The mother is a resister of the black market, and behind her death lies the secret guarded by the family.
