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

At the same time that Cui Heng completed his comprehension of the Origin of Stars.

All his fake selves sensed it, and their eyes became incomparably deep. The aura on his body suddenly rose.

It was as if he had instantly sublimated to an endless height and transcended to another level.

"The Origin of Stars is the physical manifestation of this universe. It is the foundation of the existence of this universe. The Origin of Life is the beginning of this universe, and the Origin of Death is the end of this universe."

Cui Heng muttered to himself and finally sighed softly. "All worlds must be based on the existence of matter. All worlds can't escape the beginning and end. This is the truth of the world."

With this sigh, all the Cui Heng in the universe lit up with an incomparably bright light. Billions of lights and shadows spread out from each of Cui Heng's bodies.

Soul Refinement, Observing Primordial Chaos Like a Sea of Bitterness, Under the River of Time, the Heartless Heavens Are Everlasting