The content was quite theoretically well organized. But it seems to have come from Chinese martial arts, and without revealing its source, it could be misleading, as is his original idea. For example, the third-word section that was introduced in the book at first. For those of you who are now a little bit of an expert, the best version of this book is the third-word theory. And I think this is a very traditional theory of our country's traditional martial arts that came down with the author's