@khoapro9900 and
@Hasya not really. If you want explanations :
-We begin with the first universe. Wu Dong Qian Kun (hero Lin Dong).
-There is a second universe, where we cultivate differently. In this universe, we have first the story of Fights Break Sphere-The Legend of Yao Lao (hero Yao Chen). After years, we have the story of Fights Break Sphere (hero Xiao Yan, disciple of Yao Chen).
-After that, the author has made it more complex. There is an other universe, the "shared" universe who is named the Great Thousand World. This one is an infinitely big plane and the center of all universes. In this universe, people are very strong and there are spiritual beasts. So they name the other universes Lower Planes. First, we have the story of The Great Ruler (hero Mu Chen). Furthermore, in this story, we learn that Lin Dong and Xian Yan came from their Lower Plane to the Great Thousand World. Only the strong ones, the Heavenly Sovereigns, can go in this universe. After that, years passed, and there is the story of the Heaven's List (hero Jiang Yi Nian). Once again, in the futur, there is an other story, this one, Fights Break Sphere-Return of The Beasts (hero Lu Zhun).
-The author decided to create a story in an other universe, in a third Lower Plane. This is the story of Yuan Zun (hero Zhou Yuan). We have no information of whether Zhou Yuan was strong enough to go to the Great Thousand World.