When we moved, the six girls in our dormitory suddenly realized that they had spent four years unknowingly in this small matchbox-like space. This is a time that is either empty, lonely or erotic. In this room code-named 524, what is left now is not only the rows of beautiful stickers on the wall, nor is it just Xiaoqiang hurriedly crawling in the darkness of the corner, but also those trivial and scattered memories that cannot be easily forgotten, which are the standard love and hate belonging to the six girls of 524...