The Desolate Era (Web Novel) - Book 25, Chapter 37 - Yes, Master

The world that nurtured the civilization which reached the pinnacle of magic was on the verge of destruction.
The last survivor transmigrated to the past, when the magic civilization started growing, as countless mages were still fumbling their ways through the thorny paths of magic knowledge.
He, who came from the end of the magic era, aim to reach the pinnacle of magic.

- Description from Novelupdates

Karl, a young man stuck in a rough patch after losing his job and burning through almost all his savings, wandered through the cold, dark streets of Eldoria. On the damp, silent sidewalks, he stumbled upon something bizarre: an old gacha machine mysteriously appearing at every corner he turned, almost as if it was following him. Driven by a mix of curiosity and the overwhelming weirdness of the situation, Karl finally gave in and used his last bit of money on the machine. From the gacha ball, he pulled out a card with a barcode.Back in his cramped apartment, curiosity finally won over caution, and Karl scanned the barcode. To his shock, an app called “Common Sense Manipulation App” installed itself on his phone, claiming it could alter people's “common sense.”------Support Me By Gifts or Power Stones-----

A world with magic, mythical creatures, mystical herbs, labyrinths, and treasures.A world where the strongest adventurers get to be the ones to enjoy fame and riches.A world where various rankings decide your worth.This is the world where Shye Crowley and his sister were born.As the children of two fairly known diamond-ranked adventurers, Shye and his sister, Maia, enjoyed a prosperous lifestyle.Unfortunately, after departing for a mithril-ranked quest in hopes of ranking up, their parents couldn’t return.Years passed and life went downhill fast for the siblings.Fortunately, a fateful encounter bestows him a system that could change their fate.