Jiang Ning, a skilled medical professional from the twenty-fourth century, is killed in a traffic accident while escorting a VIP and transmigrates into the body of a girl with the same name in the spring of 1975. The original owner was the daughter of village doctor Jiang Huaimin, who died saving her from a flood when she was ten years old. Orphaned and abused by her uncle Ning Jun and aunt Zhao Hongyin, the girl was sold for thirty yuan and five catties of rice to the Ji family in a neighboring village. The marriage was a superstitious arrangement known as a "marriage of fortune," intended to cure Ji Yanli, a soldier who had returned from war in a critical, unconscious state with severe head and leg injuries.
Upon arriving at the Ji household, Jiang Ning is greeted by Ji Yanli’s mother, Tian Yufang, who is kind and welcoming despite the family’s poverty. Jiang Ning assesses Ji Yanli’s condition and realizes that a fragment of bullet remains in his brain cortex, compressing his nerves. She discovers she possesses a spatial dimension connected to her birthmark, which contains a fully equipped futuristic laboratory, a villa, and various supplies. Using the space’s advanced medical technology, she performs surgery to remove the fragment, saving Ji Yanli’s life. She also uses the space to dispose of her abusers; disguised as a vengeful spirit in a red wedding dress, she kills her uncle, aunt, and cousin who had tortured and attempted to assault her, then burns their house to cover the evidence.
After Ji Yanli wakes up, he is confused about his marriage but grateful for Jiang Ning’s care. She reveals her intention to divorce him once he recovers, as she has no emotional attachment to the arrangement. However, Ji Yanli’s family treats her with warmth and respect, and she begins to integrate into their lives. She demonstrates her competence by catching fish and cooking nutritious meals, earning the admiration of her mother-in-law and sister-in-law, Ji Yansui. When Bai Yu, a educated youth who had a crush on the original owner, arrives to take Jiang Ning away, she firmly rejects him, declaring her loyalty to her new family.
Jiang Ning continues to navigate her new life, balancing her secret space abilities with the challenges of the 1970s rural environment. She faces threats from local bullies, such as Qiu Liang, whom she incapacitates and disposes of using corrosive substances from her space. As she gains the trust and affection of the Ji family, her initial plan to leave and live independently begins to shift. The story follows her journey from a reluctant bride seeking escape to a central figure in the Ji household, using her future knowledge and medical skills to improve their lives while concealing her extraordinary secrets.
