Wen Qitian, a pampered young woman from a powerful modern family, falls into a vegetative state after leaving her window open during a storm. She is transported into the world of a tragic romance novel called Shu Nü Ji Yue, inhabiting the body of Wen Qitian, the legitimate daughter of the Yongwen Marquis. In this ancient setting, she finds herself in the bedchamber of Nan Leli, the tyrannical Emperor of Jingnan, who ascended the throne at sixteen by assassinating his father and the emperor. Nan Leli is a reborn villain who, in his previous life, was manipulated by fate and died without winning the heart of the novel's female lead. In this life, he is ruthless, suffering from severe monthly headaches and a compulsion to kill, with a particular obsession for skinning victims to make lanterns.
Wen Qitian is delivered to the palace by her own father, Yongwen Hou, as a desperate political gambit to appease the Emperor's wrath after he exiled the Imperial Tutor, Su Daren, who is Wen Qitian's maternal grandfather. The Emperor, initially intending to kill her, finds himself inexplicably weakened whenever he attempts to harm her. Wen Qitian discovers she possesses a supernatural ability: whenever she strikes Nan Leli, he becomes physically limp and powerless. This power is linked to a system she must serve, which tasks her with lowering the Emperor's Darkening Value from 100% to 0% so she can return to her original world.
The core conflict arises from the clash between Wen Qitian's modern, self-preserving instincts and Nan Leli's tyrannical nature. Rather than submitting, Wen Qitian uses her ability strategically. She slaps him to neutralize his threats, hides under his bed to avoid detection, and manipulates his emotions by feigning fear and vulnerability. Her actions inadvertently lower his Darkening Value, granting her small respites and rewards from the system. Meanwhile, Nan Leli is confused and intrigued by this woman who dares to strike him yet seems genuinely frightened. He suspects she is poisoning him or using sorcery, yet he cannot bring himself to kill her, finding her antics strangely soothing during his painful episodes.
Key turning points include Wen Qitian's first slap, which leaves the Emperor limp and allows her to survive the night. She later steals food from the Imperial Kitchen, leading to a confrontation where she offers him a pastry, further confusing his perceptions of her. When the Emperor suffers a severe headache episode in his study, Wen Qitian slaps him again, stabilizing his condition and earning his reluctant tolerance. She also witnesses the brutal punishment of the eunuchs who delivered her, realizing the deadly stakes of her position. The narrative reveals that Wen Qitian's father has secretly legitimized his illegitimate daughter, Wen Jiyue, who is the novel's original female lead. Wen Jiyue watches from the shadows, plotting to replace Wen Qitian and secure her own future, adding a layer of familial betrayal and rivalry to the court intrigue.
The story direction follows Wen Qitian's adaptation to palace life, where she is confined to Nanli Palace. She navigates the dangerous dynamics with Nan Leli, who oscillates between murderous intent and a strange, possessive curiosity. Her goal is to complete the system's tasks and return home, but the time dilation between worlds means every day spent in the past risks aging her family in the present. As she continues to use her slap ability to manage the Emperor's volatile state, their relationship evolves from predator and prey into a complex, bickering partnership. Wen Qitian remains determined to survive and maintain her independence, while Nan Leli begins to see her as the only constant in his chaotic, predestined world.
