Haunted House for Rent: Don't Open the Door Early in the Morning

To save money, I rented a super cheap old house. The agent only told me one thing: At three o'clock in the morning, no matter who knocks on the door, don't open it. I didn't take it seriously until the first night—— There was the sound of nails scraping the wooden door from outside. The lights in the living room turn on and off by themselves, In the mirror, there was a woman I didn't recognize. Later I found out...