Situ Yuan, the third princess of Tianqi Kingdom, has been doted on since she was a child and deeply in love with Prime Minister Pei Ji. However, this love has brought disaster. Three years ago, during the peace talks after the war between the two armies, Pei Ji chose to send Situ Yuan as a hostage to the enemy Beili in order to get back Lin Wanru, the daughter of a loyal minister who had "life-saving grace" for him. During his three years in Beili, Situ Yuan suffered inhuman torture from the third prince of Beili and suffered heavy physical and mental injuries. After returning, he met his true love Ajin in despair and witnessed his murder, thus embarking on a long road of revenge. In the end, the great revenge was avenged, and a spiritual bond with Ajin was achieved.
