My betrothed has returned, as an assassin seeking my life— The story of Seora, who returned as an assassin, and Heejin, who loves her with all his heart, intertwined with the ruthless political strife and fierce power struggles that unfold within the imperial palace. A royal edict arrives for the King of Yeon, who reigns over the northern province of the Empire. It commands him to marry Lee Seora, the half-born daughter of Count Lee Yonghyuk. In truth, Lee Seora is an assassin hired by the Empress, who seeks to restrain Yoon Heejin, whom the Empress views as a threat. Heejin, however, quickly perceives this. Yet, the two share a profound bond from their past, and Heejin has never been able to forget her, longing for her all this time. Seora, who lost her memories before the age of twenty and became an assassin, vaguely recalls him, and as they confirm their mutual feelings, they joyfully accept their marriage. However, the two are helplessly entangled in the Imperial Court’s power struggles, and the political battle for the Imperial throne begins to rage across the Empire—!!!