Zhao Xiaojin is a nine-year-old girl living in modern times who feels neglected by her busy parents. After her mother gives birth to a younger brother, her schedule becomes filled with extracurricular classes, leaving her with little quality time with her family. One day, while waiting for a car after an after-school class, she suddenly finds herself transported to an unfamiliar location. She stands on a yellow dirt road surrounded by fields, wearing her modern clothes. Fearful but alone, she begins to walk along the road, hoping her parents will realize she is missing and come to find her. She worries that because her parents are so busy, they might eventually give up searching for her.
Her solitude is short-lived. A tall, dark-skinned middle-aged woman drags her away. When Zhao Xiaojin regains her ability to move, she is terrified and begs not to be locked up, but her pleas are ignored. She is confined to a small room and given only half a bowl of porridge with a strange smell. A day later, people arrive at the residence. The woman changes Zhao Xiaojin into a red silk outfit and pushes her outside. Zhao Xiaojin realizes that she has not only been transported to a different place but likely to a different era as well. She observes a large group of people dressed in clothing similar to that of the Qing Dynasty imperial palace, though less colorful than what she has seen in television dramas. She cannot understand their language, nor can they understand hers.
An eunuch leading the group examines her with a satisfied smile and stuffs her into a dark carriage. The journey lasts more than half a day. Inside the carriage, Zhao Xiaojin is terrified, wondering if she has been sold or kidnapped. She eventually falls asleep from exhaustion and fear. At dawn, Li Rongjing, the chief eunuch of Yikun Palace, arrives at a smallpox isolation residence. The Eleventh Prince, who had recovered from an illness but came here for variolation, has fallen into a coma and may be dying. The Empress Consort, desperate to save him, has arranged a chongxi marriage, a ritual intended to bring good fortune by marrying the prince to a girl with a favorable birth chart.
Li Rongjing has been searching for a suitable girl since the previous day. He finds Zhao Xiaojin, a girl with a fair complexion and clear eyes, who barely meets the criteria. He wakes her from the carriage and instructs her to enter the isolation residence, telling her not to look around or speak recklessly. He warns her that if the prince wakes up, she must serve him well. Zhao Xiaojin, confused and frightened, follows him. She enters a place that resembles a park but is filled with gates and guards. The air grows thick with the bitter smell of traditional Chinese medicine.
She is led through multiple gates until she reaches a room where adults wrapped tightly in clothing emerge one by one. Inside, the air is heavy with smoke from candles and charcoal braziers. Zhao Xiaojin is placed behind a folding screen in front of a little bald monk lying on a bed. The door closes behind her, leaving her alone with the unconscious boy. She notices the faint marks on his face and realizes he is likely suffering from smallpox. Remembering a video she once watched about chongxi ceremonies, she deduces that she has been brought here to act as a symbolic bride to save the prince's life.
As she sits at the foot of the bed, wondering what to do, she looks at the boy. He has long eyelashes and faint eyebrows. She questions whether a monk can get married and why he is in this situation. Suddenly, she notices that the boy's eyes are open, and he is looking at her strangely. The story ends with this moment of connection between the modern girl and the historical prince, setting the stage for her survival in this unfamiliar time period.