After years of evolution, there is no word "Zheng Dan" in Beijing Opera. Generally speaking, Beijing Opera has four roles for young women, namely, Tsing Yi, Hua Dan, Beijing Opera Blues and Udan, and there is also a kind of flowered shirt, which is between Tsing Yi and Hua Dan, but I personally don't accept this view. The White Snake, the legend of the white snake, belongs to Tsing Yi, or a flowered shirt. But in the traditional "stealing fairy grass", the white snake is Wu Dan.