One Piece: Capitalist Brook's Crew Expansion Plan - Chapter 82: The Admiral Enters the New World

Graduate student Yi-han finds himself reborn in another world as the youngest child of a mage family.

– I’m never attending school, ever again!

‘What do you wish to achieve in life?’

‘I wish to play around and live comforta-‘

‘You must be aware of your talent. Now go attend Einroguard!’

‘Patriarch!’

My future would be guaranteed once I graduate. For my future!

Chen Rui, an otaku from earth, is reborn into a human body in another world, who falls into the legendary evil, brutal world of the devil called Mozu where humans are treated as food. He has to survive while facing horrors of the devil, violent dragons and a variety of power enemies depending on a strange super system chip and his wits. Surrounded by Devil’s beauties such as black-bellied lolita princess, cold queens, violent dragons, charming poisonous devils …

Wanting to live in the Devil’s world is hard! Wanting to live in the Devil’s world as a human is harder! Wanting a human to be the devil’s son-in-law is hardest!

Let us see how a small otaku uses power and strategy step by step starting from an ordinary human to writing a legend as the devil’s greatest son-in-law.

- Description from Novelupdates

The spiritual energy recovers, others practice, and Xu Bai upgrades.

After getting the game system, because I haven’t received the main mission, I frantically spent 22 years of experience points.

Then……

Xu Bai suddenly discovered that he was already invincible.

Practice exercises.

Full skill.

Everyone: “Why don’t you have a bottleneck.”

Xu Bai spread his hands: “What’s the bottleneck, click to upgrade, isn’t it enough?”

- Description from novelbuddy

In a modern world where cultivators need a place to cultivate or vent their boredom, there are private businesses that set up instance dungeons with the aid of technology and cultivation magic to enable cultivators to train and commoners to experience the life of cultivation. They are called dungeon suppliers.
Xie Jin's one and only dream was to be a dungeon supplier and when his only relative passed away, the relative's inheritance gave him a plot of land and surprisingly, a 'System' Module which the relative had previously used.
With the help of the system, Xie Jin decided to pursue his dream of becoming the number one dungeon supplier.