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

"Master's cultivation realm is getting higher and higher!" Li Mingqiong could not help but sigh. At this moment, she was carefully looking at the various phenomena in the sky. There was a phenomenon that symbolizes the power of the light of humanity—the lights of myriad families!

It was also called the Light of Civilization!

If she could comprehend some of the mysteries of this phenomenon, it would be enough to help her no longer have any bottlenecks before she stepped into the Twelfth True World Realm.

Pei Qingshu was also staring fixedly at the sky. He was also comprehending the mysteries contained in the phenomenon and could not help but sigh. "We're too far away from Master now!"

"That's right." Hui Shi stood at the side and nodded. He sighed softly. "We're too far away."

Soul Refinement, Observing Primordial Chaos Like a Sea of Bitterness, Under the River of Time, the Heartless Heavens Are Everlasting (3)