Main •
Bai Yu as Zhao Yunlan / Kunlun :The director and leader of the Special Investigation Department (SID). He is the reincarnation of the ancient war hero Kunlun, the Black Robe Envoy's comrade-in-arms (and, in the original novel, also his lover). He works with Shen Wei to save Haixing from destruction. •
Zhu Yilong as Shen Wei / Black Robe Envoy / Ye Zun :A bio-engineering professor who later joins SID as a consultant. Shen Wei is the civilian identity of the Black Robe Envoy, who seeks to find the four ancient holy tools and keep the peace between the humans and the Dixing. Zhu also portrays Ye Zun, Shen Wei's twin brother and the primary antagonist of the series.
Supporting • Xin Peng as Guo Chang Cheng / Xiao Guo : An intern at SID. He is clumsy and cowardly, but kind in nature. • Li Yan as Da Qing / Black Cat, Fat Cat, Dead Cat. :The deputy director of SID. A Yashou who is able to transform into a cat and former comrade to Kunlun, he became immortal after touching one of the holy tools, but suffers from memory loss and has no memory of Kunlan or the Black Robe Envoy. • Gao Yu'er as Zhu Hong :A secretary at SID, though she frequently participates in field missions. A Yashou who is able to transform into a snake, she fell in love with Zhao and left her tribe so that she could work with him at SID. • Wang Naichao as Zhu Jiu :A villainous Dixing leader and underling to Ye Zun, who seeks to establish the domination of the Dixing over the surface-dwelling races. • Jiang Mingyang as Chu Shuzhi :A field agent at SID who uses psychic
marionette strings to fight. A Dixing who was banished after being convicted of murder, he joins SID and later becomes the Black Robe Envoy's spy within the organization. • Min Tingliu as Lin Jing :SID's resident technical genius, adept in various fields of science. Responsible for forensics and experiments. • Li Siqi as Wang Zheng / Ge Lan :The human resources manager at SID, although she generally performs secretarial duties. An etheric being (i.e., a
ghost) who is the descendant of an ancient tribe. • Wang Chao Wei as Sang Zan :The archivist at SID. Wang Zheng's lover, and like her, an etheric being. He appears later in the show after being rescued by Wang Zheng. He has difficulties maintaining a physical form, and has trouble speaking and moving. • Wang Weihua as Zhao Xinchi :Zhao Yunlan's father, and the former director of SID. • Ju Xiaoyun as Ya Qing :A Yashou who is the elder of the Crow tribe. She initially helps Ye Zun in order to revive her tribe, but later realizes her mistakes and turns to the SID. • Ma Liang as Ying Chun :A Yashou who is the elder of the Flower tribe. • Hao Shuang as Sha Ya :A Dixing who possesses electrical powers. She is also Lin Jing's lover. • Yuan Ye as Mister Yan :Ye Zun's subordinate. • Wang Yongfeng as Cong Bo :An intelligence agent who offers external assistance to SID. • Jing Long as Guo Ying :Deputy director of the Investigation Bureau. Guo Changcheng's uncle. • Dong Fan as Li Qian :A student at Dragon City University. Later becomes a researcher at Haixing Research Institute. • Zhou Xiaohai as Ouyang Zhen :A professor at Haixing Research Institute. • Ji Weigang as Lao Li :An employee of SID who makes food for Da Qing. ==Production==