Xiao Tangning, the true daughter of the Prince of Jing's estate who has been lost among the commoners for eighteen years, finally returns to the estate only to stumble upon a shocking conspiracy. Wen Ruying, the Marchioness of Ning'an, fabricated lies about a noble and auspicious fate, secretly swapping the infants back then to let the fake daughter Xiao Hanwei usurp her status and glory, while also colluding with the crown prince to tamper with the disaster relief accounts of Qingzhou and steal the Prince of Jing's military achievements. Clear-headed and merciless, Xiao Tangning never acts as a softhearted saint, and with the help of her sharp-tongued yet reliable brother, she follows the clues to gather evidence of their crimes. Xiao Hanwei sees through the reality that she is merely an abandoned pawn and turns around to testify in court.