In fact, men and women live on the same floor, and the frequent ambiguous and embarrassing location is the water room. Because this is a place that everyone must come every day. Before I moved to the fourth floor, this place was actually like the dormitory buildings of all the men and women in universities across the country. Every day is dull and unremarkable, and all kinds of trivial things happen between girls. But with an outsider like me, it is like a stone suddenly thrown into the calm water surface, and layers of ripples spread out.