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

Immediately after, they felt a warm current appear that filled their limbs and bones, flowing through the meridians in their entire bodies, allowing them to be reborn. Chen Tangwen realized that not only had he recovered his Profound Gate Realm cultivation, but his aptitude and foundation had also increased drastically. His future path of martial cultivation should be smooth.

Jue Xin was even more shocked and thought to himself, "As expected of an Immortal fruit bestowed by an Immortal. It actually pushed me to the peak of the Inner World realm!"

He had just broken through to the Xiantian realm, and now, the Xiantian True Qi in his body had already exceeded the limit of the Xiantian realm. He also had some understanding of the construction of the small celestial world in his body. He estimated that he would be able to break through and become the top expert of the Inner World realm in three to five days.

Space-Time Dao Mark Stabilized, Breakthrough Imminent (2)