" Chang 'an Twelve Hours " was an ancient spy drama adapted from an online novel. The drama was directed by Lu Lu, and it starred Lei Jiayin, Li Qin, Zhou Yiwei, and others. If we had to choose an actor based on the character characteristics of the play, I think Lei Jiayin might be more suitable to play the role of Zhang Xiaojing. He was cunning, quick-witted, and had a venomous tongue, which matched the character of Zhang Xiaojing. At the same time, Lei Jiayin's acting skills were also recognized. He was able to play such a complicated role well. Li Qin could play the role of Shentu Shi. She was gentle, smart, kind and so on, which matched the character of Shentu Shi. Li Qin's acting was also very good. She could play such a complicated role very well. Zhou Yiwei could play the role of Li Bi. He was smart, decisive, and determined, which matched the character of Li Bi. At the same time, Zhou Yiwei's acting skills were also recognized. He could play such a complicated role well. Other actors such as Ma Dehua and Niu Junfeng could also play different roles in the play, but they might not be able to fully interpret the character's personality and emotional changes.