A double bride swap unfolds beneath a shocking conspiracy. The heroine, Lu Qingci, is forced to take her elder sister’s place and marry Xie Jue, the Marquis of Jingbei’s heir, who is rumored to be sickly and cruel. The hero, Xie Jue, has likewise been replaced by his twin brother, carrying a secret on which his family’s survival depends. The two “impostors” meet amid lies, come to understand one another through danger, and eventually join forces to stir up turmoil in both the imperial court and the martial world.