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 raised his eyebrows slightly when he heard this. This answer was indeed beyond his expectations. He said in a low voice, "Taihong Star has entered the Heaven Realm?"

At the side, Hong Renxu also looked at his big brother in surprise. He had never told him about the Heaven Realm. He had never heard of it before.

"It's said to be." Hong Renxi nodded. "2,000 years ago, the legendary Door of Heaven opened outside Taihong Star and sucked in the entire planet.

After a period of time, Taihong Star was spat out again and landed at its current location. The essence of the entire planet has improved greatly, and cultivation has become easier.

During this drastic change, 99% of the people on Taihong Star died. Very few survived. My grandmother died when Taihong Star was spat out of the Door of Heaven.

Path to Soul Formation