C273 Happy Birthday Xiaoxi

It's late now, and most of the students have left, so there shouldn't be anyone coming back to the library, and the librarian on duty is in the hall on the first floor, and unless there's a special situation, he won't be coming upstairs. Who could it be?

And judging from the footsteps, there was more than one person coming.

The campus of Shengqiao University was open