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

"This door is called the Samsara Myriad Worlds Gate. It's a supreme treasure personally made by my master." He Wuyou stood beside the door of light and introduced it to everyone. "After entering this door, one will be randomly reincarnated into a world. Your identity after reincarnation is also random. You might be from a rich background a born into poverty. You might even enter a primitive society where you have to eat raw meat and drink blood. Moreover, your memories of this life in the Immortal Land will be blocked.

If you can understand your true pursuit and goals in that life and implement your will and do your best to pursue this goal, you will regain your memories.

Such people who have recovered their memories can walk out of the door of light at any time. At the same time, they can return to their original state. The criteria for passing the assessment are the 120 people who will walk out of the door of light first.

Samsara Myriad Worlds Gate, The Completely Unfamiliar Power (3)