Naruto: Kurotsuchi Mayuri - Chapter 55 - 36.2 : Uchiha Clan Meeting!!

Chen Feng, of modern earth, had suffered bad luck since birth. After finding the legendary “lucky artifact,” his bad luck peaked and he became the only person killed in an earthquake. By a twist of fate, he found himself transmigrated into a different and magical world! A world much larger than earth. A world only partially explored due to the dangers within. A world where human civilization centered around genes. In this world, human beings possessed all sorts of abilities due to genetic fusion. Some went on to create world-changing technologies with their mysterious genetic abilities, while others went on to become undefeated genetic warriors with their combat genetic abilities. How will Chen Feng fare in this new world?

“The lifespan of a butterfly is between three days and a month, and most butterflies only live for a week.”
“Like them, I have only a few months to live, maybe less.”

–

The first time Hu Die met Jing Yu, he thought she was a world-weary girl who committed suicide.
The second time they met, he told Hu Die indifferently: “If you jump down again today, I’m not saving you again.”
Later, she told him: “Jing Yu, don’t feel sorry for me.”

Later, Jing Yu returned to the arena and won the glory that belonged to him.
Under the flashing lights, he suddenly remembered the girl’s voice, and said a nonsensical remark in front of thousands of people.

——”I’m not sad, I just think that at such a moment, it would be better if you’re here.”

“He is a whale swimming in the ocean. One day, a butterfly inadvertently broke into his frequency. That was the most beautiful moment in his life.”

- Description from Novelupdates

This story is centered around the man named Yi Ji-Hyuk, who has spent 1000 years in a Medieval Western fantasy-like world before returning back to the modern-day Earth. When he returns, he finds that his home is facing monster threats, and that humans with superpowers have appeared to protect the innocent people of Earth.

Shen Gu, an ordinary university student who discovers that he is a “spare tire” in his social circle.With the help of a system, he gradually rises to the top of life!