Noodles in soup: Xiaoming was reading in the library and found 100 yuan in a book, but he cried. Why is Xiaoming crying?

Tang Di: Xiaoming is an unpopular writer. He put 100 yuan in his own book in the library. If anyone sees it, they will take it away, which means that someone has read his book. So far, this 100 yuan is still in the book, which means that no one has read Xiaoming's book, so Xiaoming cried.