Naruto System in One Piece - Chapter 379

The protagonist of the collapse of the three former civilizations is Dr. Mei. What is the end of logic, the strongest brain, super intelligence, this is the story of the strongest scientist of Honkai with knowledge of the moon becoming the god of science!

- Description from novelbuddy

As Mingguang Sect’s esteemed Immortal Master, Yi Ning had never experienced much heartbreak and suffering. He had always expected his life to be smooth-sailing, and was only waiting to ascend before marrying his disciple with whom he shared mutual affection.

However, he had never expected that on a rainy night, his disciple brought back a childhood friend.

They were close and intimate, to the point… of sharing a bed.

Standing before the bed where they were entwined, Yi Ning’s heart was as cold as sunken ice. He had wanted to end it all cleanly and straightforwardly, yet had never expected that his disciple not only wanted his childhood friend, but wanted his Shizun too.

His disciple shattered his spiritual core and laid down a hex, throwing him into the main hall to await nightfall to consummate their relationship.

Just as he had fallen into despair and wanted to end his life, he unexpectedly discovered a strange book. The book detailed his life, and the him it described, from beginning to end, was nothing more than a tool used to satisfy his disciple’s desire to conquer, lowly and wretched as a cultivation furnace.

Yi Ning’s head spun, and his heart gave birth to a strong hatred. He dragged his wrecked body to the back of the mountain and released the Demon Venerable Yan Xuan, who he had personally sealed nine years ago.

In return for undoing the seal, Yan Xuan would aid him in escaping.

After the man heard the reason why, he leaned against the wall and smiled with a hint of mockery. Yi Ning had thought he was going to ridicule him for having deserved it, being betrayed by an ingrate who bit the hand that fed him.

Yet, what he never expected was for Yan Xuan to reach out and tug him into his embrace, and the words that left his mouth were instead:

“You fool, I’ll help you take revenge.”

After this, he killed all those who wronged him, and cradled him close to his heart.

He wants to shatter your cultivation and mangle your limbs, to turn you into a bird in a cage, free for him to humiliate.

Yet, with this lowly and dirty heart of mine, I want to pull you from the swamp and cut down the heavens for you.

- Description from Novelupdates

A normal guy gets hit by a truck and isekai'd. Why? Because trucks are apparently some cosmic loophole. He decides to be a dungeon, because it sounds weird and interesting to be one. Is it? Let's find out.

After ten thousand years of cultivation, he could have achieved immortality. However, his lack of human experience led to his failure to attain immortality.Thus, he resolved to immerse himself in a century of human existence, seeking to enhance his journey toward immortality. What he didn’t anticipate, though, was that upon entering the human world, he would find himself cast as a son-in-law, facing disdain not only from his wife’s parents but also from his beautiful wife herself.Armed with a wealth of cultivation knowledge, how could he transform his drab human life?