Hou Wanjun, a concubine-born daughter of a marquis’s household, was forced into a substitute marriage. On her wedding night, she struck a deal: three years of freedom in exchange for using acupuncture to save the ailing prince Wang Kaizhi. Deep within the prince’s manor, she established herself through her medical skills, while he relied on her to navigate the court. The needles set more than a three-year term; they tied together two hearts unwilling to let fate dictate their lives. When secrets from the past come to light, can this marriage of convenience become a true love match?