Breaking the Spatial Wall of the Nine Domains World is actually not impossible for Xu Zimei with some effort.
But the problem is, the Heavenly Dao has its own rules.
It's permitted to enter the Nine Domains, a large world, from the Yuan Central Continent, a smaller world.
So every generation of Great Emperor is qualified to ascend.
However, returning from a large world to a small world is not allowed and may even violate the rules of the Heavenly Dao.
The Heavenly Dao has its rules, and those who break them will end up in pieces.
Therefore, Xu Zimei must be fully prepared.
This is also one of the few instances of opposing the rules of the Heavenly Dao.
In fact, over the years, Xu Zimei, due to his own strength, has always avoided direct confrontation with the Heavenly Dao.
This doesn't mean he is afraid.
The main reason is that although his strength has increased rapidly, there is still a long way to go to become invincible.
