Xubaizhai is just an ordinary study; it just becomes more lively at night. Here, the characters in the book will have different mental powers due to differences in the history of the book, its popularity, the number of characters in the book, their personalities, and even their placement in the study. The direct manifestation of mental power is the size of these characters when they appear in the study at night. As the bookkeeper in the study, Xiao Pu leads a bizarre life with day and night reversed. She never knows what will happen in the next moment... She only knows that she must protect the secrets here and the characters in every book... Otherwise, can you imagine one day finding out that Jia Baoyu is no longer in "Dream of Red Mansions" and Hermione is no longer in "Harry Potter"... The most important thing is that after two years in the study, she actually doesn't understand her boss at all.