In the fictional Great Jing Dynasty, the distinction between legitimate and concubine-born children is strict. Su Weiwan, the concubine-born daughter of the prime minister, was raised in the countryside from a young age. After returning to the capital, she unexpectedly becomes caught up in the princes’ struggle for the throne. Relying on the medical and poison arts she learned in the countryside, along with her exceptional wit, she goes from being forced into the role of a pawn to maneuvering at every turn and stirring up the court. In the end, she and the patient, scheming Seventh Prince Xiao Che use each other even as their feelings quietly deepen. Together, they overthrow the tyrannical crown prince and his powerful ministers, then join hands to build a golden age.