In the preface of this book, Gu Long leads the appearance of "the end of the world", "the bright moon" and "the knife" with a poetic sentiment and a poetic language: "Is the end of the world far away?" "Not far!" "If people are at the end of the world, how could it be far away?" "What color is the bright moon?" "It's blue, as blue as the sea, as deep as the sea." There are about 27 videos related to the end of the world, the bright moon, and the knife...