Horror Dungeon: I Became the Ultimate Dungeon Booster

To bring his grandmother back to life after she died in an accident, A Jiu joins a company that runs people through horror-game instances...

In order to buy a Rebirth Pill worth ten billion, he leads the ghosts in the instances into a new kind of business venture. As the business expands and the instances grow more difficult, he accidentally learns that someone is searching for the “Origin.”