Ye Yun, a top-tier Elixirist from a mysterious 21st-century organization, awakens in the body of a sickly noblewoman who shares her name. The original host, the legitimate daughter of the Protectorate Duke, had died of rage after discovering her betrothed, Crown Prince Mo Heng, in an intimate embrace with a palace dancer. Upon inheriting this new life, Ye Yun immediately recognizes the Crown Prince as unworthy and resolves to annul their engagement. Using her knowledge of medicine and her understanding of court dynamics, she manipulates the situation to gain the Empress Dowager's intervention, successfully dissolving the alliance while maintaining her family's dignity.
During her recovery, Ye Yun encounters Mo Qingchen, the Emperor's younger brother and a figure of immense power and aloofness. Unlike the Crown Prince, Mo Qingchen is physically imposing, exceptionally handsome, and carries a hidden, severe internal injury that has plagued him for years. Ye Yun, relying on her expertise as an Elixirist, diagnoses his condition merely by touching his wrist and offers a precise prescription for his cure. In exchange for this life-saving treatment, she boldly demands a romantic relationship with him, a proposition that surprises the typically reserved prince. Despite his initial coldness, Mo Qingchen is intrigued by her audacity and unconventional nature, eventually accepting her terms and gifting her a precious jade pendant as a token of their connection.
As Ye Yun begins to rebuild her health and navigate the complex social landscape of the Imperial Capital, she faces opposition from rivals such as Su WanYing, a woman who harbors ambitions to become Crown Princess. The Empress hosts a Hundred Flowers Banquet, an event designed to showcase noble ladies and potentially fill the vacant position of Crown Princess. Ye Yun attends not only to assert her independence but also to locate rare medicinal ingredients, specifically Snow Spirit Grass, which she believes the Empress possesses. During the banquet, she is confronted by Su WanYing and other noblewomen who mock her frail health and lack of talent. However, Mo Qingchen and the Emperor intervene, silencing her critics and publicly acknowledging Ye Yun's presence. The Emperor, aware of the growing bond between his brother and Ye Yun, encourages Mo Qingchen to pursue the relationship seriously. Throughout these events, Ye Yun balances her dual identity as a modern medical expert and a fragile noblewoman, using her wit and knowledge to secure her position while gradually healing both herself and the man she has chosen.
