Naruto: The Outsider's Resolve - Chapter 3.19 (078):

The well-known and recognized throughout the Stern continent, strong and mighty, as well as the unique Wizard of magic cures, the most outstanding genius of the whole continent, Jason got into the flow of time, back in the uncivilized era during the first failed experiment, 3000 years ago. This was the period when the magic healers didn’t exist. How will Jason apply his knowledge in this backward era, wherever he reach the peak of glory?

- Description from Novelupdates

In the near future of South Korea, where everything is determined by aptitude tests, the protagonist Kang Moon-soo gets the job of a “Shaman”.“A shaman? What’s that? Do you earn a lot of money? Is it stable?”The profession of shaman has nothing in common with Moon-soo’s aspirations. He ends up becoming a freelance problem solver, a million light-years away from a stable life!Will Kang Moon-soo be able to sustain a livelihood as a shaman?

In the year 2050, the world changed drastically when mysterious portals began to randomly appear, bringing with them terrifying monsters dubbed Transcendents and unimaginable dangers. Humanity nearly collapsed entirely, and the survivors took refuge in cities and secure areas, protected by individuals with special abilities called Awakened. These Awakened were the only humans capable of entering the portals and exploring the unknown realms on the other side, in search of resources, treasures, glory, or answers.

Kaito, on the other hand, was just an unhappy young man who found solace in a classic online game called Mortal Tower, where he created an avatar of a powerful and charismatic villain. While many hoped to become Awakened, Kaito believed that even if he lived a million lives, he would never have the fortune to become one. However, one fateful day, fate played a trick on him. He woke up and naturally looked at his reflection in the bathroom mirror, but he could hardly believe what he saw. Kaito strangely resembled his Mortal Tower avatar.

And to make things even better, Kaito somehow inherited the purchasing system from Mortal Tower, which would allow him to buy all kinds of items, from rare abilities to legendary equipment!

Now, Kaito has to deal with his new life in an almost post-apocalyptic world full of opportunities, but also with a new great challenge called Celestial Abode, something even greater than the classic dungeon-crawling portals, something so similar to the early floors of Mortal Tower that it scares him. However, Kaito sets a goal for himself: conquer the top of both worlds, but he doesn't know it will cost him his selflessness.

(Obs: No, he's still not a villain at first. There is a development for him to become a villain.)

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Send a mayfly to the world, a drop in the vast ocean!

Ye Chen woke up and found that he had traveled to the Qing Dynasty. Looking at the father lying on the bed, and the mother doing laundry for the neighbor

I thought it was an ancient farming text.

But with the awakening of the system! Only to find that everything is not so simple.

In Xiling in the south, there are Tufuzi running around, there is a restaurant with the same name in the capital, and the Zhang family in the northeast…

In the ancient building

Zhang Family: What the hell are you, you didn’t exist in history!

Ye Chen: I exist to change history.

In the Tomb of King Lu

Wu Xie: Brother’s tattoo is so handsome! He must have some special story..

Fatty Wang on the other side: No! I think Ye Chen’s is more handsome, okay?

Wu Xie turned her head to look: Damn!

Until the combination of various abilities of Shan Hai Jing, he also detached and became an ancient god,

To understand the true meaning of this world.

- Description from novelbuddy