In the 15th year of Qingshuo, Princess Li Conghuan of Zizhou marries Crown Prince Mo Heng, but her true motive is revenge. Once in love with the Second Prince, Mo Jin, she witnessed the brutal murder of her mother and her newborn child. Returning to the palace, Li Conghuan is determined to avenge their deaths, but her former love, now the Crown Princess' husband, struggles to believe she would go to such lengths for power. Caught in a web of assassination attempts and suspicion, the two must navigate misunderstandings and hidden intentions as their paths intertwine once more.

青朔十五年，孜州九公主李从欢与青朔太子墨珩和亲，青朔满国一派喜庆氛围。殊不知，李从欢此来只为复仇，她与青朔二皇子墨烬原是恩爱眷侣，却在生产当日亲眼目睹自己的母妃与刚出世的孩子被二皇子手下杀害，至亲惨死，挚爱背叛，再次归来，李从欢誓要亲手为自己的母妃与孩子报仇。再次相见，昔日爱人成为堂堂太子妃，墨烬亦不想相信李从欢会为了权势对自己赶尽杀绝，对李从欢充满了不甘与怨愤。一个频频刺杀，一个步步试探，在两人的种种交锋与互动中，终发现竟是满腔的错位与误会。