In ancient times, Emperor Human, Zhao Ming, sacrificed himself on behalf of the people to resist the divine realm. After Zhao Ming's fall, his beloved, Hun Dunzhu, risked her life to save a fragment of his soul, thus establishing the cycle of reincarnation for eternity. In a distant future, Zhao Ming was reincarnated as Xie Xuechen, the leader of the Immortal Alliance, while Hun Dunzhu became the Holy Virgin Mu Xuanling in the Dark Realm. The two eventually reunited in the mortal realm, but they had forgotten their past, becoming adversaries in a battle of "good against evil." Mu Xuanling saved the gravely injured Xie Xuechen in the Dark Realm and compelled him to travel together as a sign of gratitude for saving her life.