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 as Cui Heng left.

All the commoners in Changfeng Prefecture City felt a wave of heat surging in the sky. However, when they looked up, they only saw a fiery red dragon shadow flash past.

Many people thought that they were hallucinating and soon forgot about it.

However, the people in the State Overseer's Office were different. They truly felt this scorching power.

A Fire Dragon more than 30 feet long appeared in the inner courtyard of the State Overseer's Office.

Under the extremely shocked gazes of Liu Litao, Chen Tong, Zheng Nanxun, and the others,

"I am Huo San, guarding the mortal world under the orders of the Immortal Venerable. If you encounter any danger, you can wake me up."

With that, it transformed into a fiery red coiling dragon pillar and stood in the State Overseer's Office.

Everyone present felt their minds buzz.

On the Moon, Mystic Palace Maroon Book