In the capital of the Great Zhou dynasty, Jiang Rui, the legitimate daughter of the Marquis of Zhenbei, dies of illness in a humble courtyard. Yet her soul drifts back to the day three years earlier when she was forced to marry in her younger sister's place.
- Jiang Rui is shocked to discover that she has been reborn at sixteen, just as her stepmother, Madam Lin, and her younger sister, Jiang Wei, are forcing her to take her sister's place in the marriage.
- In her previous life, she refused the substitution and was drugged by her stepmother, falling gravely ill. This time, Jiang Rui decides to play along and accept the marriage, while secretly watching her stepmother and sister's schemes.
- Jiang Rui appears obedient, but inside she is already plotting how to use this chance at a new life to change her fate.
