Modern detective Lin Xia travels back to ancient times due to a fatal mistake, only to find that she has become the inner demon of the serial killer "The Tailor" - she can glimpse the memory of the murder, but is trapped in the murderer's consciousness and cannot escape. The undercurrents in the north and south districts divided by the canal are surging, and the rich and black market transactions are woven into a web. She must use dreams and hints to guide the real murderer to reveal himself, but she does not know that there is a blood-stained dagger hidden behind the admiring gaze of Xiao Jingheng, the young minister of Dali Temple. When the betrayal of the maid Qing He tears apart trust, and the down-and-out lawyer Shen Yan delivers the key to redemption, Lin Xia struggles on the edge of memory dissipation: Should she reveal the truth and trigger a power struggle, or should she let the murderer complete the ritual that should have taken her life? In this cat-and-mouse game that spans time and space, the winner takes all and the loser loses his soul.
