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

An envoy from the Great Jin Imperial Court?

Ever since he left the Beginner's Space, although he had been using the political environment to collect the seven emotions of life, he had never interacted with the royal family.

After all, since a hundred years ago, the Great Jin's fortune had been declining day by day. Even now, the Imperial Court's government decree could not even leave the Central Continent. The letter of appointment of a local governor was only a token of goodwill.

This Imperial Court could be said to only exist in name.

Even if the Great Jin had stolen Hong Fugui's fruits of war 261 years ago, Cui Heng could not be bothered to destroy them.

That was because even if he left them alone, the Great Jin might not be able to survive for another ten years.

Emperor Jianyan, Wei Yi, was already 49 years old, but he did not even have a son.

The loyal generals were even all killed by him.

To Be a Ruler of a Fallen Country (1)