A chapter. According to the relevant public information, Mr. Ruan's non-fiction author created a chapter and completed what was not clear in the feature film. Fanwai is a supplement to the text, not into the text. Fan wai is the part where the author actively joins the theme. Fanwai is a branch story outside the main story. One is to treat the characters differently and create a new short story, but the story similar to the main body is told or staged by others.