"You mean that the parallel space is connected with Earth?" Lin Yun asked in a deep voice.
It seemed that this was the only explanation, as how else could the man have said so solemnly that if those people were in the parallel space, he could not detected them with the surveillance device he had placed outside Earth.
"As far as I know, thousands of years ago, possibly due to changes in nature, those people entered that parallel universe. At first, some people returned occasionally, but over time there were fewer and fewer returns, most likely once every fifty years," the middle-aged man nodded and said.
"Once every fifty years?" Lin Yun frowned.
"Rather than saying they 'come out,' it's more like they 'descend.' You've seen 'Journey to the West,' right? How they speak of Heaven and the Immortal World; they refer to the parallel universe as the Immortal World and when they come out it means they 'descend to the mortal world," the middle-aged man smiled and said.
