As the only descendant of an ancient family of mystical doctors, the heroine Gu Qinghan was forced to join the top wealthy Ling family because of a "critical illness" request that she could not refuse, and became the "exclusive physician" for Ling Yunche, the heir to the Ling family. However, she soon discovered that Ling Yunche's strange disease was not innate, but caused by a chronic poison that had the same origin as occult medicine but was extremely sinister. Wang Xiaoran, the retired soldier responsible for protecting Ling Yunche, used his sunny and cheerful appearance as a cover and was keenly aware that Gu Qinghan's arrival broke the hypocritical calm of the Ling family.
