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

Ever since Cui Heng obtained the messages from the five Immortal swords, he had never come into contact with any news related to Jiang Qiqi.

It was as if she had really completely disappeared from this world.

Now, it confirmed Jiang Qiqi's two messages.

The Unparalleled Demon sealed at the core of the earth, and the Purple Extreme Heavenly Palace.

Moreover, after flipping through the ancient book provided by Zhang Shuming, Cui Heng had reason to suspect that the great demon he had killed after stripping away his Immortal Golden nature was very likely one of the ten Mystic Deity who had besieged Daoyi Palace 3,000 years ago.

He was the elder of the Purple Extreme Heavenly Palace back then.

"If that's really the case, why did he turn into a great demon who had lost his mind? Why was he sealed? Did the Purple Extreme Heavenly Palace perish because of this?

Revenge, The Emperor Requests an Audience