Tang Xi, a genius cultivator from the Xuanmen Daoist sect, transmigrates into the body of a sixteen-year-old girl who shares her name after tearing apart a sect talisman. She discovers she has replaced the original Tang Xi from a melodramatic romance novel, inheriting the girl's memories of being switched at birth. Sixteen years ago, a hospital fire led to a baby swap: Tang Xi was raised in poverty by her grandmother after losing her adoptive parents, while Tang Jing, the biological daughter, grew up as the wealthy Tang family's beloved only child. The Tang family recently discovered the truth and brought Tang Xi back to Jiangnan City.
Upon arriving at the Tang family mansion, Tang Xi is shocked to find the estate infested with ghosts, including a water ghost in the fountain and a hanged ghost under a tree, indicating that the supernatural world is far more active in this reality than in her own. Despite the Tang family's attempts to welcome her with material gifts and a pink-themed room, Tang Xi feels no emotional connection to them. She quickly establishes boundaries, requesting to live at school to avoid conflict and maintaining a cold, detached demeanor toward her new family. The Tang family, particularly her father Tang Zhenying and mother Yang Wenqiu, continue to favor Tang Jing, treating Tang Xi with a mix of guilt and dismissiveness.
At Jiangnan No. 1 High School, Tang Xi struggles with the academic gap between her rural education and the rigorous curriculum of the prestigious school. During an exam, she encounters a male ghost named Yu Mingfan, a top student who died from overwork before his college entrance exam. She seals him in her pencil case and later negotiates a deal: he will tutor her to help her reach the top three hundred in her grade, and in return, she will create a proper vessel for his soul. She also befriends Qi Sihui, a timid but kind classmate, and interacts with Shi Rui, a class bully, and Cheng Yihang, a top student.
Tang Xi's life takes a turn when she intervenes to stop three boys from abusing a stray white cat. Using her spiritual powers, she swaps the soul of the lead abuser with the cat's for twenty-four hours as a lesson in empathy. The cat, now intelligent and grateful, chooses to follow her. Tang Xi also discovers a amulet within her soul, named Yun Qi, which begins to awaken as she approaches a sealed haunted house. The house, where multiple deaths have occurred, is protected by a powerful seven-star Daoist seal, suggesting the presence of a strong entity inside. With Yun Qi awake and her new companions, Tang Xi prepares to explore the haunted house, marking the beginning of her journey to reclaim her power and navigate this ghost-filled world.
