Main •
Tan Songyun as Xiao Yao / Ning'an • Xiao Yao: A half-human, half-demon girl who once made a living by scamming people while pretending to be a demon hunter. Although she was born to a human couple, she carries demon blood, which makes her a half-demon. Her fate changes when she accidentally awakens the Demon King. • Ning'an: Princess of Human realm who betrayed and killed Hong Ye one hundred years ago. •
Hou Minghao as Hong Ye : He is the Demon King who has lived for thousands of years. One hundred years ago, he fell in love with the human princess Ning'an, who betrayed and killed him for being a demon. However, his primordial spirit survived, and one hundred years later he is awakened by Xiao Yao, a half-human, half-demon girl who looks exactly like Ning'an.
Supporting • Wang Duo as Bing Zhu : Demon slayer and the captain of Feiyu guards who despises demons. • Huang Jiajing as Lu Pianpian : Disciple of the Dreamshard Immortal. • Guo Yunqi as Xiao Ming / Xiao Mu : Cat demon of the demon valley who is very loyal to the Demon King Hong Ye. After Xiao Mu died, Xiao Ming protected his soul, causing the two to share the same body. • Li Junhao as Luo Luo • Zhang Xiaowan as Da Li • Li Jing as Zhi Fu • Cui Shaohan as Ji Yan • Xie Zecheng as Bamboo Demon • Ye Liu as Hei Wu • Jin Shijie as Emperor Tian Sheng : Current Emperor of the Human realm who desperately wanted to obtain the Yuli Spring to achieve immortality. • Dai Xu as Ao Hen : One of the ancient great demons who was sealed by Hong Ye ten thousand years ago. • Wang Sen as Qiong Qi : One of the ancient great demons who was sealed by Hong Ye ten thousand years ago. • Hu Wei as Teng She : One of the ancient great demons who was sealed by Hong Ye ten thousand years ago. • Liu Xingchen as Wu Heng • Wu Yue as Jin Muqing • Li Qian as Madame Jin •
Chen Xinhai as A Li • Zhao Yi as Xiao Dadan, Xiao Yao's father • Zhao Zheng as Emperor Ning An • Tao Bao as Zi Xiu • Meng Asai as A Li • Wang Xinqiao as Long Yu • Wu Qi as older Long Yu : Previous Demon King and one of the ancient dragons. • Wang Yifei as Long Zhi
Guest appearances •
Zhao Liying as Dreamshard Immortal : Originally a celestial maiden, she descended to earth and fell in love with a human due to her attachment to the mortal realm. Later, she collected the Kunlun Mirror for her lover, but was betrayed by him. It caused her to refine her heart into the Crystal Heart, thus becoming a spirit. She resides in the Realm of Mist and Void and desperately wants to find the Yuli Spring so that she can return to Heaven realm. ==Soundtrack==