A modern office worker who believes in the philosophy of lying flat transmigrates into the daughter of a minister in the Kangxi era, Niohuru Qing. She plans to hide her talents and fail the imperial selection, but an accidental display of modern knowledge gives her away, and Kangxi arranges her marriage to the cold-faced Fourth Prince, Yinzhen. After the wedding, the modern textbook she has lost becomes a weapon in the Fourth Prince's hands, and the two embark on a game of testing each other over secrets, trust, and love.
