Sorry everyone, I'm stuck. Let's think about it slowly.
Song Qing worked as a librarian in the library. The next moment, he and the people around him were transported into the world of books.
System: Warning, please find people who should not exist in each story, or who behave abnormally, otherwise you will stay here forever.
But they soon discovered that some characters in the book were also looking for them.
Purpose: Mathematics and Physics