Nightmare Reappears

My wife is in labor; I'm going to be a dad! My parents also moved from the countryside to help me take care of my wife. Five years ago, I lost my memory, but now I'm incredibly happy. The moment I saw the delivery driver, I seemed stunned. My wife died, and my parents cursed: 'Liar! This isn't what we agreed on!' 'So delicious! Haha, I think I remember this scene happening before. I realize I am not me. I am a demon!! I'm in so much pain! Haha, hurry up and do it! Live in pain forever!' Police determined that one word in this letter was altered. Five bodies were found at the scene. The killer was mentally disturbed and has been arrested.