When the rivers and lakes met, the young people made a promise to share the same fate. Mu Qingyin, the general's daughter, left behind the heroes of the martial arts world to accompany the down-and-out prince Xiao Yi on his journey to become the heir apparent. However, the imperial power was corroded to the bones, suspicion grew wildly, the pain of losing a son and the destruction of the family followed one after another. The vows she made under the bright moon turned into ashes. She burned the palace and died wearing the red dress she first saw, leaving the emperor to sit thousands of miles away and guard the empty palace alone. The rest of her life was full of endless regret.