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One night, a tall man in black knocked on the door of Chris, an old man living alone, killed him, and made it look like the old man hanged himself. Chris's last thoughts were of his nephew Jason. Although Jason has been favored by his parents since he was a child, he suffers from fire phobia for reasons that remain unknown. Starting from July 13 of this year, he received three anonymous letters one after another, completely breaking his peaceful and happy life. Because there is a photo in each of the three letters, each photo is about a cemetery or a tombstone, with the words "You are dead", "You think you are still alive, but in fact you do not exist" and "August 18th, your death date" written on the back. Jason slowly discovered that his life was not as beautiful as it originally was. He began a frantic search for his own grave.