A diagnosis of bone cancer sends Cheng Wanxing unexpectedly transmigrating into the body of an unloved, concubine-born daughter of the Chancellor’s family. Forced into a proxy marriage to Pei Yan, the bloodthirsty Prince of Zhenbei, she is framed for adultery just three days after the wedding. Using her modern-day wits, she sees through the plot, unaware that the marriage was a pawn in a power struggle within the imperial family from the very beginning.
At a palace banquet, she cleverly uses a Western Regions glass cup to expose evidence that the Crown Prince has colluded with the enemy and betrayed the country, but this sparks a coup in the Eastern Palace. Amid flashing blades, Pei Yan shields her in his arms. “If you want to die, you’ll have to get my permission first.” Two lonely hearts quietly begin to draw closer. As they grow closer, she discovers that the cinnabar mole at the corner of Pei Yan’s left eye conceals a mystery. The cold poison that flares up every new moon is closely tied to the imperial secrets surrounding the late emperor’s sudden death twenty years ago and the mysterious death of Pei Yan’s mother.
Meanwhile, Cheng Mingzhu, the legitimate elder daughter of the Cheng family, secretly allies with a witch. In the cellar, she hides forbidden magic capable of controlling people’s minds. The dark red tattoo on Crown Prince Li Chengzhao’s sleeve leads to an even greater conspiracy to usurp the throne. Drawing on her modern medical knowledge and combining it with ancient Gu techniques, Cheng Wanxing develops an antidote. But in the process, she discovers that the truth behind her transmigration is intricately connected to the ancient seal on Pei Yan and a lost imperial treasure.
Power struggles and true feelings intertwine, while conspiracy and salvation go hand in hand. Amid the treacherous upheavals of the imperial court, Cheng Wanxing and Pei Yan join forces to clear away the layers of deception and write a sweeping tale of love and hatred across time, amid bloodshed and chaos.
