My name is Li Shangyu. I went back to school and was sleeping in the dormitory. I heard someone knocking on the wall in the dormitory next door. I lay on the bed and felt panicked. There were only two people in the dormitory, one was my friend, and I couldn't sleep all night.
The sound rang for a while and then stopped. I thought it was someone from the dormitory next door knocking, but there was no one in the dormitory next door. There was no one on the floor where I lived, and the doors of other dormitories had long been locked.
If it wasn't someone from the dormitory next door, then who could it be?
Intention: Brave