Hidden Assassin - Chapter 58

In the vast forests, towering mountains, and the wide seas, mythical creatures spread across the wide world. Some are large and terrifying, while others are small and gentle; half of them enjoy harming humans, while others wish to help them.No one knows exactly when they appeared. Some say they existed before the human race emerged, while others claim they appeared alongside the first humans in this world.Their forms and abilities vary, and different races deal with them differently. Some despise them and consider them monsters, while others revere them. Yet everyone agrees on one thing: it is best not to attempt to meddle with them.Everyone, that is, except for one person.

A boy from 21st century Earth, met an accident and later was reborn in Naruto’s Ninja World.
He is born in Uchiha Family and becomes the useless brother of Itachi Uchiha and Sasuke Uchiha…. Let’s see how he changed the Naruto world.

- Description from Novelupdates

He is the master of six kingdoms. As long as he wanted, his cavalry is ready to wipe off any country.

Tian Han was a young boy who admired immortals. His dream had always been to become like them—flying on swords, using spells. But he was just an ordinary village boy, and he didn't have much of a chance for that. So, he always read books about immortals, and his admiration for them grew more and more every day. One day, he heard that he had a chance to become an immortal.“You can become immortal.”This was the sentence where his adventure began. Yes, he could become an immortal. And so, his journey started, and he found himself in the ruthless world of immortals.