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

Cui Heng narrowed his eyes when he heard this, and the golden light in his palm instantly expanded.

Dense runes suddenly flowed on the golden light. Every rune was a light that shone on the purple-black old man.

"Ah, ah, ah!" The old man screamed. His face was ferocious and twisted in extreme pain.

Wherever the golden light shone on, wisps of purplish-black smoke would rise. It was very sinister.

However, under the purple-black smoke, one could vaguely see a golden Buddhist light.

It seemed that he had been infected by the purple-black power and had lost his mind.

At the same time, Cui Heng also discovered the essence of this old man.

To be broken to this extent and still be equivalent to the Ninth level of Qi Refinement.

If his soul was complete, his strength was very likely to be equivalent to the early-stage Foundation Establishment realm.

3,000 Years Ago, Sky Ruins Evil Bug