Only One Year Left to Live? Flirting Madly with the Crazy Crown Prince to Survive!

Yan Yuning transmigrates into a novel as the cannon fodder, the biological younger sister of the female lead, Yan Shiyao. She learns she has only one year to live before the story's villain, Crown Prince Xuan Yanyu, kills her after forcing his obsession with Yan Shiyao upon the entire Prime Minister's household. Desperate to survive, Yan Yuning attempts to alter the plot by courting the male lead, Qi Qingchen, to prevent the romantic rivalry that leads to her death. Her efforts are constantly thwarted by the unyielding narrative forces and the predatory attention of Xuan Yanyu, who finds her defiance amusing yet infuriating.

Upon returning to the Prime Minister's residence, Yan Yuning faces hostility from her stepmother, Chu Wantang, who favors Yan Shiyao. When Chu Wantang attempts to punish Yan Yuning with a family whip, the Prime Minister intervenes, demanding equal treatment for both daughters. Meanwhile, Xuan Yanyu, who is obsessed with Yan Shiyao, monitors Yan Yuning's interactions with her sister and the male lead. He becomes increasingly agitated by Yan Yuning's boldness, particularly when she openly flirts with Qi Qingchen in public, disrupting the destined meeting between the male and female leads.

Yan Yuning's survival strategy shifts when she attempts to poison Xuan Yanyu. She buys arsenic under the pretense of pest control and prepares a poisoned drink for her sister. Xuan Yanyu discovers her scheme but, rather than killing her, forces her to drink raw duck blood to counteract the poison, revealing that he is aware of her intentions. This encounter establishes a tense dynamic where Xuan Yanyu protects Yan Yuning from death while simultaneously tormenting her, viewing her as a curious anomaly in his rigid world.

The plot thickens when Yan Yuning befriends Bai Yue, the legitimate wife of Magistrate Chen Kai, who is being slowly poisoned by the favored concubine, Liu Sisi. Bai Yue reveals that her illness is a result of past family grievances connected to the political upheavals that destroyed Liu Sisi's family. Yan Yuning seeks the antidote from Xuan Yanyu, who initially refuses but eventually provides it through his network, further entangling her in his sphere of influence. Bai Yue ultimately drinks a fatal dose of poison offered by Liu Sisi, dying while confessing that she was adopted and not the biological daughter of the Prime Minister, thereby absolving herself of the original sin that triggered Liu Sisi's revenge.

As the Emperor orders the princes to experience commoner life, Yan Shiyao follows Qi Qingchen, deepening their bond. Yan Yuning accompanies them, continuing her attempts to sabotage the romance while navigating the dangerous proximity to Xuan Yanyu. He intercepts her attempts to separate the leads, mocking her efforts but also displaying a possessive interest in her actions. The story concludes with Yan Yuning realizing that direct confrontation with the plot is futile, yet she remains determined to find a loophole that allows her to survive without becoming a victim of Xuan Yanyu's eventual madness.

Xuan Yanyu's behavior becomes increasingly erratic; he oscillates between threatening Yan Yuning and ensuring her safety, driven by a confusion he cannot articulate. He intervenes when Chu Wantang attempts to punish Yan Yuning again, using his status to intimidate the Prime Minister's wife. This protection is not born of affection but of a desire to control the narrative around his obsession, Yan Shiyao. Yan Yuning exploits this dynamic, positioning herself as a useful, if annoying, pawn who can distract or manipulate situations to her advantage.

The tension escalates when Yan Yuning is caught in compromising situations with Xuan Yanyu, such as when he drags her away from Yan Shiyao under the guise of protecting her from her stepmother's wrath. These interactions reveal that Xuan Yanyu is aware of Yan Yuning's transmigration and her knowledge of the future, though he chooses to treat it as a game. He tests her limits, forcing her to drink medicinal soups and endure his cold demeanor, all while preventing her from executing her original plan to steal the male lead.

Yan Yuning's internal monologue reveals her growing frustration and fear. She recognizes that her attempts to change fate are being countered by the novel's inherent logic, yet she refuses to accept her canonical death. Her alliance with Xuan Yanyu becomes a fragile truce, where she provides him with information or distractions in exchange for her continued existence. The story ends with Yan Yuning still in the early stages of her struggle, having survived the initial poisoning incident and the death of Bai Yue, but facing the looming threat of the original plot's catastrophic conclusion.

The relationship between Yan Yuning and Xuan Yanyu evolves from predator and prey to a complex partnership of mutual suspicion and reluctant reliance. Xuan Yanyu begins to see Yan Yuning not just as the sister of his obsession, but as an individual who challenges his authority and predictions. Yan Yuning, in turn, learns to navigate his volatile temper, using her wit to deflect his anger and turn his attention away from her fatal flaw. The narrative sets the stage for a prolonged battle of wits, where survival depends on outmaneuvering both the story's plot and the crown prince's unpredictable nature.