The book mainly tells the story of Qi Xia's encounter with a life that was not hers in the school library.
"Qi Xia, do you want to go to the library on the weekend?"
"Qi Xia, tomorrow is your birthday, I have prepared a birthday gift for you; you will definitely like it!"
"Qi Xia..."
..."Beep, beep, beep, beep -"
"Cheng An, happy wedding"
Intention: Every important person in every period of life will become passers-by and memories.