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

Amidst the kowtows and thanks, Cui Heng slowly descended from the sky and arrived at the Wang Family's mansion.

At this moment, there was no one inside.

That was because during the battle outside, everyone had gone to the city wall to look at the battle outside.

However, Wang Dongyang, Wang Donglin, Wei Yi, White Tiger Child, and the Human Immortals from the various aristocratic families rushed over and greeted Cui Heng respectfully.

The people from the four Immortal sects followed behind hesitantly. They were afraid of death and did not want to go over, but they did not dare to not go.

After witnessing Cui Heng's strength with their own eyes, no one felt that they could escape from him. Those who had that kind of thought must have something wrong with their brains.

Taiyi Mystic Immortal, Purple Extreme Heavenly Palace