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Connect to parallel worlds through dreams. Every dream is a strange and weird new world! An ordinary young man inexplicably possesses this mysterious ability to travel through dreams. In each of his dreams, he will appear independently in other parallel worlds, or possess himself in other parallel universes. Each world has its own unique laws, culture, and natural laws that are different from other worlds. Every time he travels through time and every time his ability to learn in different worlds will be engraved in his genes, this ability can be used as long as he is in a world with the same natural laws as the learning world. You can travel through the past, you can change history, or you can kill your grandfather before you are born, but what can be changed can only be the history of another world. You may think that you have changed history, but for that world, it has not. He is still moving forward according to his own trajectory.