Lin Yiyi is a modern woman with a medical background and martial arts expertise who begins experiencing vivid recurring dreams of ancient times. After discovering a mysterious pendant that grants her access to a self-contained space with a house, farmland, and healing hot springs, she realizes she is destined to transmigrate. With a countdown of one hundred days remaining, she liquidates her substantial inheritance, stockpiling massive quantities of food, clothing, medicine, and supplies in a rented warehouse. Her preparations are cut short when she is killed in a car accident caused by a truck with failed brakes, transporting her consciousness into the body of a sixteen-year-old girl in the Great Wei Kingdom.
The original host, also named Lin Yiyi, was the legitimate daughter of Marquis Lin Hongda. After her mother’s death, her father married Zhang Meixin, who brought her illegitimate daughter Lin Qinglian into the family. The stepmother and stepsister conspired to drown the original Lin Yiyi to remove her as an obstacle to Lin Qinglian’s marriage to the First Prince. Upon waking, Lin Yiyi immediately defends her mother’s loyal maid, Madam Zhou, from public whipping, asserting her authority and revealing the truth to her indifferent father. She establishes a close bond with Madam Zhou and her maid Xiao Tao, forming a trio that relies on each other for survival in the hostile household.
Lin Yiyi discovers that her mother’s dowry, which should have been hers, has been embezzled over the years by her stepmother. Through the help of her mother’s former steward, she recovers hidden account books proving the theft and reclaims control of the family businesses. She uses this newfound wealth to improve her living conditions and secretly compensates the Southern War Prince, Yang Chengmo, after accidentally injuring him during a chance encounter. The War Prince, who suffers from a poisoned body and infertility, has been dreaming of Lin Yiyi and begins secretly observing her.
The central conflict centers on the upcoming Hundred Flowers Banquet, where noble families seek suitable matches for their daughters. The First Prince is the primary target for Lin Qinglian, supported by her mother and their aunt, the Imperial Noble Consort. Lin Yiyi, uninterested in marrying into the imperial family, decides to use the banquet to further isolate herself from marriage prospects by performing martial arts instead of traditional arts. As the banquet begins, Lin Yiyi navigates the political tensions between the imperial family and the powerful War Prince, while her stepfamily plots to sabotage her reputation. The story follows her efforts to secure her independence, manage her hidden space resources, and survive the dangerous court intrigues while maintaining her true identity.
