Introduction to the adult novel "The Mountain Shape Still Pillows on the Cold Stream·Extra" - The purpose of the extra is very clear, to complete the shortcomings in the text, to add the plots of Tang Manqing and Li Yan and Li Yan, and to add some characters that everyone thinks should appear.For this purpose, the extra was redesigned and conceived. In order to seek rationality, it led to the contradiction and incompatible content in the main text. Therefore, I said that the extra and the main text are actually not something that can be connected.