Horror Short Story | Mailbox

When Shen Li moved into her new apartment, the building manager handed her a mailbox key and said, "Your mailbox is number seven, at the end of the hall." She nodded and took it. A week after moving in, she hadn't received any mail. One day, on her way downstairs, she decided to check her mailbox. It was empty, except for a flyer. As she took it out to throw it away, she noticed something written on the back in red pen: "You've moved in. Good." She figured it was a prank by the previous tenant and didn't think much of it. The next day, she opened the mailbox again. There was an envelope inside. No stamp, no return address, just her name on it. She opened it. Inside was a photo. The photo showed her sleeping the night before, taken from the corner of her room. She was in her pajamas, lying on her side, the blanket pulled up to her shoulders. She froze and flipped the photo over. On the back, a line was written: "You kick off your covers when you sleep. You should stay warm." She immediately called the police. The officers came and inspected the mailbox, saying the lock showed no signs of tampering and that someone might have slipped it in while she was out. They suggested she install a security camera. She installed a camera, pointing it at the mailbox. The next day, she opened the mailbox. There was another letter. This time, it was a screenshot from a video. It showed her standing in front of the mailbox, looking down at the letter. The photo was taken from behind her. She rushed home to check the security camera footage. The video showed her standing in front of the mailbox, looking down at the letter. But there was no one behind her. She zoomed in, frame by frame. As she looked down, a hand emerged from the wall at the edge of the frame, its fingers long, gently touching her shoulder.