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The earth is divided into three realms, the human realm, the ghost realm, and the fairy realm. 500 Years after the establishment of the ghost world, the ghost king made a will before his death: before becoming an emperor, he must experience the vicissitudes of the world and the journey of love. The world is hot and cold. If the experience is not completed, one can only abandon the emperor and throw himself into the abyss of the three realms. The human world and the fairy world will not interfere.