Rebirth 1983: Building My Business Empire - Chapter 5 - 4 Stepping Stone

Jerry traversed across worlds and arrived in a Beast Summoning era. In this world, everyone could summon their own pets. Darkness was looming, and the world was in turmoil. Relying on the power of their summons, many shrines plundered the resources at every corner of the world like tyrants. But when everyone else was summoning adorable pets that could help them in battle, Jerry discovered that his summoned pets were a little different. Other people's pets are all kinds of beasts, but Jerry summoned gods from Greek mythology! King of the Gods, Zeus, “Master! I, Zeus, is at your command!” Athena, “I will fulfil all your requests, master!” Poseidon, “I will conquer this sea in the name of the master!” In constant summons, step after step, Jerry became the supreme ruler of this world!

[Sys--... ini--tializing...][Err0r: M3m0ry c0rru--ion d3tect3d. Pr0c33ding 4nyw4y.][Miss10n: Unkn0wn. Purp0s3: Und3f1n3d. Proc33d.]Laverne never believed in the supernatural. To him, life was already complicated enough without worrying about things like ghosts or reincarnation. But when a reckless act of bravery ends in fire and chaos, he wakes up to something far worse than death—an unfamiliar world governed by an unfathomable system.Marked as an Anomaly, an existence that shouldn't be, he finds himself entangled in forces beyond mortal comprehension. The world he is reborn into runs on the concept of Ka, the essence of life and fate itself. Yet, unlike others, his Ka does not conform—it rebels. The system that governs this world struggles to define him, its very framework warping around his presence.With each step forward, he realizes that his mere existence is enough to tip the scales of destiny. Some will seek to control him. Others will try to erase him. But one truth remains:'In a world where fate reigns supreme, what happens when something stands outside of its design?'

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.

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Copy:

Undercover police officer: We are two-on-two, so we can’t be careless.

FBI undercover: I’m in a one-on-three, and I have to be vigilant.

Zhenjiu: My teammates are very reliable, I don’t need to worry at all, and I give comrade hr Jinjiu a five-star praise.

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The semi-invincible text, some of the protagonists refer to Dazai Osamu, the stray dog.

Without a heroine, the only thing that can make the hero’s heart beat faster is the bill.

- Description from novelbuddy