The Dragon Emperor

"There was no flying passage 20 years ago. The cultivators can only fly through the heavens through their own cultivation. Then a great emperor of the heavens wants to take a treasure from the mortal world, so he will use the sky to match the sky map. The barrier between the two circles was broken. Then there was a flying passage that many people could easily travel to.

But the great emperor can only maintain this channel for twenty years, and all are now closed. Since the repair of the great emperor was far from reaching the extent of breaking the barrier between the two realms, there were many problems with the passage he opened.