C559 Antecedent(2)

Although there was a saying of the Nine Heavens in the Heaven Realm, no one had ever set foot in the Ninth Heavenly Layer. Even the four Immortal Emperors of the Immortal Realm did not know where Yuelun Tian was? Therefore, Mercury Sky actually became the last Heavenly Layer of the Immortal World.

Among the four great emperors