Lin Qingran, a modern woman, transmigrates into a novel just three days after her transfer, inhabiting the body of the Crown Prince Xiao Heng's betrothed. The original character was a minor antagonist who died tragically in the story, but Lin Qingran's arrival coincides with a major deviation: Xiao Heng, the novel's primary villain, has faked his death after surviving an assassination attempt at the border. Upon arriving at the Eastern Palace for the funeral, Lin Qingran discovers the coffin is empty and Xiao Heng is alive, hiding in his bedchamber to recover from severe injuries while investigating the conspiracy behind the attack. Simultaneously, Xiao Heng discovers that he can hear Lin Qingran's inner thoughts, which starkly contradict her outward performance of grief-stricken devotion. While she verbally expresses deep love and concern for her fiancé, her internal monologue reveals she views him as a "dog man," finds the palace staff attractive, and openly criticizes the plot and other characters, including the Emperor and the Third Prince.
The core conflict arises from this dual deception. Xiao Heng must maintain his ruse of being dead to root out the traitors within the court, while Lin Qingran must pretend to be the original character's lovesick fiancée to avoid suspicion and protect her new family, the Lin clan. The Lin family is destined to fall due to their political entanglement between Xiao Heng and the protagonist, Third Prince Xiao Che. Lin Qingran aims to navigate these treacherous waters by maintaining a low profile and ensuring her grandfather's faction does not turn against Xiao Heng prematurely. However, her ability to inadvertently reveal private information through her thoughts complicates matters. She accidentally discloses to Xiao Heng that his mother, Empress Qi, is pregnant—a secret that has caused tension between the Emperor and Empress due to past misunderstandings. Xiao Heng uses this information to intervene in his parents' relationship, hoping to stabilize the imperial family while he recovers.
As the story progresses, Lin Qingran is forced to stay in the Eastern Palace to "care" for the recovering Crown Prince, a situation she finds terrifying given her knowledge of his ruthless nature in the original text. She struggles to balance her modern sensibilities with the rigid expectations of the ancient court, all while trying to prevent the original plot from destroying her family. Xiao Heng, intrigued by her contradictory behavior and the unique ability to hear her true thoughts, decides to keep her close to monitor her intentions. Their dynamic shifts from mutual suspicion to a complex partnership, as Lin Qingran becomes an unwitting ally in his political maneuvers. The narrative follows their attempts to alter the doomed fate of the original story, with Lin Qingran using her knowledge of future events to guide Xiao Heng away from his antagonist path, while he relies on her insights to navigate court intrigues he cannot see. The tension builds as they must conceal their true feelings and knowledge from the Emperor, the Third Prince, and other factions vying for power, all while the wedding date approaches and the political storm surrounding Xiao Heng's survival begins to gather strength.
