Unknown Letter

An ordinary author found a letter in his mailbox one day with no signature and no address. He didn't know if someone was playing a prank or if it was misplaced. But driven by curiosity, the author took out the letter and opened it. There was a lot written in the letter, and the handwriting was a bit messy. It seemed that the person who wrote the letter was a little anxious and panicked. The emotions of the person who wrote the letter seemed to be transmitted through the paper, making the person who read the letter unconsciously become nervous. The author took out the letter and left without noticing that there was an identical letter lying there quietly in the corner of the mailbox, as if this letter had always been there and as if this letter had just appeared... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.