The Demon King Bai Ze is about to awaken. Before the chaos in the Three Realms, the immortal disciple Mu Qing went to the Demon Realm to search for the magical tool Qingluan Mirror to kill the Demon King. By chance, they embarked on a journey together with the Little Demon Chaoyan. They met and fell in love during their adventure,As she was about to complete her mission, Mu Qingcai realized that Chaoyan was the reincarnated demon king. The fate of the two worlds was destined to be tragic.