Originally wanted to write this postscript, but helpless, the adjustment of the website made me drag until now.

this book is finally finished, and the ending is not too bad. I think I'm satisfied with it. Looking back, I've been a little bit unconsciously since the book was uploaded. When I finished it, I found that I had written more than one million words. At that time, I felt a little complacent. It was not easy. The graduation thesis of the University was only 8000 words, I've been working hard for more than a week, and now I've written countless graduation papers

I'm tired every day when I come back...