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

The realm of the Upper World Angels was usually at the Deity Realm.

However, they were basically the best among the Deity Realm experts. They had all unlocked more than six Divine Treasures on their bodies at least. Compared to the Great Jin, where most Deity Realm experts had only opened two or three Divine Treasures, they were much stronger.

Not to mention, these angels essentially represented the will of the main sects in the Upper World. In a sense, they had the right to kill these branches in the Lower World.

Even the family heads, elders, and Deity Realm experts of the lower realm did not dare to be disrespectful to the Upper Realm Angels.

Even if the Angels only sighed softly, it was enough for the Deity Realm experts of the Lower World to carefully figure out if they had done something wrong. Did they make the Upper World Angels unhappy?

When Wang Huaiyi saw Cui Heng "pretending to be an Angel", he was like this as well.

Orders from the Upper World's Sect Masters