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450 million years ago, the earth and the moon were together. At that time, there were 9 time and space in the world. People in each time and space had their own missions. Because of the different evolution of life, different civilizations were advanced. Among them, the ninth and eighth time and space worlds were undoubtedly the most advanced. Due to greed and selfishness, they all wanted to control the planet. 260 Million years ago, the 8th and 9th time and space used space to enter each other's time and space to engage in large-scale wars. However, in order to prevent the destruction of the world, scientists from the two worlds, after a lot of careful calculations, sent a step of the earth to the outside of the sky and the earth. From then on, the door of time and space was closed forever. In order to be able to communicate with the scientists of the two time and space in the future, they jointly created a door of communication, and there is only one key to this door.