I had no friends in a strange city for the first time, so I could only hold it in at home every night. That night I felt like the neighbor was knocking on the wall with "dong, dong, dong". It was so annoying in the middle of the night. I knocked back on the wall casually, and suddenly I thought of the house I rented. It was a house near a cold mountain. There was no next door. Cold sweat broke out on my body. I saw a crack in the wall. A bloodless face with deep features appeared in the wall. He suddenly opened his eyes wide and smiled at me...