Sole Cloud Flying Cave

Cui Heng was transmigrated to another world and the system told him that the new world he was in was a high-grade Xianxia world.
It was a world where Celestial Kings soared the sky and terrifying monsters ruled the lands. The strong would destroy a planet if their mood was bad and Cui Heng trembled in fear when he learned of how scary the new world was.
Thankfully, the system had granted him the protection that last for 300 years. As long as he remained in the safety zone, he would not receive any damage.
With his safety secured, he began his cultivation training for the next 300 years.
Throughout the years as he trained, some people entered his safety zone by mistake.
There was a peasant who was once a monk and a beggar. Despite that, he still had the dream of bringing peace to the land and saving the lives of millions.
There was a noble who was once called the once-in-a-million-year genius. Yet, luck wasn't at his side and his talent fell and was laughed at by others for years.
There was a princess whose only wish was to find her older brother. She could've become a celestial but decided to remain in the human realm to wait for her brother's return.
There was a weak lady who was plagued with illness from birth but had the goal of adventuring and helping the poor and weak.
...
Cui Heng befriended these people and even gave them a few pointers before they left.
300 years later, when the protection period had ended, he had finally mastered the Golden Core. Even then, he was still reluctant to go to the outside world.
But when he did, he realized that the world was merely a world of Wuxia.

Realizing This Is A Wuxia World After Cultivating For 300 Years

The Great Dao Light Ball was essentially an external phenomenon of Cui Heng's cultivation. This also meant that Cui Heng's strength had become stronger and had truly reached a level comparable to the Three Supreme Gods. Next, as long as he occupied the timeline of the past and became an existence as ancient as the Three Supreme Gods, his strength would further increase and directly surpass the Three Supreme Gods.

At that time, it would be much more convenient for him to understand some ancient secrets.

"There's no need to go back too far. I'll go back to the time when the Supreme God of Man successfully expelled the Supreme Gods of Heaven and Earth from the Primordial World." Cui Heng quickly made a decision.

Then, he directly condensed a space-time dao mark at that incomparably ancient time point and became a living being who was personally experiencing that history.

However, this living being was too powerful, bringing a small change to that era.

Rewinding Time, Era of the Supreme God of Man (2)