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

There was a Taiji Golden Hall on Mount Chonghe.

Legend has it that this was the place where ancient Taiji Immortals attained the Dao a long time ago. It contained mysterious Dao runes that could help people comprehend the Dao, pry into the mysteries of True Immortals, and obtain supreme divine powers.

The foundation of the Taiji Sect was also this Taiji Golden Hall.

His Ancestral Master comprehended the Great Dao in this Taiji Golden Hall and obtained the inheritance of the ancient Taiji Immortals. With this as the foundation, he established the current Taiji Sect.

Therefore, in the Taiji Sect, the status of the Taiji Golden Hall was extremely high. Only the Sect Master had the right to enter and exit freely, and only the Sect Master could cultivate inside.

Unless one had received a personal summons from the Sect Master, no one could enter the Taiji Golden Hall without permission.

Scene in the Deepest part of the Six Heavenly Gates Diagram