1, Wang Wei is Cao Cao and Wei Wudi. Cunning and suspicious, good face. 2. This is the source of "grasping the knife". (See Shi Shuo Xin Yu Rong Zhi). Later generations used "catching a knife" to mean doing something instead of someone, and "catching a knife" meant body double. Recently, most of the graduation theses of college students were written by "knife catchers".