Overview: Postman Qian Haozhe discovers that he can receive letters from the past. The writers are all people who are about to die, asking him to prevent their own tragedy. He successfully rescued the little girl who wrote the letter, but found that the girl's parents were supposed to have died in the car accident, and those living now were actually "fake" - they had no shadow and always repeated the same sentence. When he received the letter he wrote ten years ago, there was only one line on it: "Don't save that girl, she will live instead of you."
