Female Warrior - Volume 2, Chapter 3: Number, 3, The Third One

Leon Walker, the world-weary genius of modern world, is killed in a freak accident — the notorious Truck-Kun makes an appearance. Death is only the start. He finds himself reborn in a new world, Galvia, reincarnated into the strong but failing body of Duke Leon Moonwalker, one of the only three Grand Dukes of the Moonstone Kingdom, a minor but strategically powerful kingdom within Galvia. As Leon attempts to understand his new world, a strange voice resonates in his head. “Supreme Spouse System Activated.”.

This is a story about a legend, of one that can never be forgotten.
Summer, first time down the mountains in 16 years, after being raised by his 3 masters and Fairy sister.

‘Why won’t you follow the Rules of society?’ The rules are the tool made by the strong, so I follow my own rules.

‘Why won’t you just use your brain instead of your brawn?’ Idiot! Have you ever seen anyone use their brain, to get back at an ant that bites them!? No, they just casually step on it.

‘Oh, everyone says you’re a first-class beauty huh?’ well, I’m sorry but even you are not qualified to be my wife. Only a ‘Summer class beauty’ is worthy enough!

‘My enemy is sick?’ Oh, don’t worry, even if you’re on your last breath and I feel it’s beneath me to slap shot you dead. I’ll just fix you up and then beat you!

‘Who am I?’

“I am Summer in the spring, the autumn, and the winter, I’m the world’s first above the heavens!”

Follow me, Summer Day as I step by step become known as the world’s first master, the world’s first doctor, the world’s richest man…… a lot of other world’s number one, but most importantly, The worlds happiest man.

- Description from Novelupdates

Extraordinary and decadent world.

Individual power determines order.

The family masters knowledge, monopolizes resources, and increases its heritage from generation to generation.

Fate, physique, spiritual consciousness, comprehension, spiritual roots, Taoist tools…

All elements leading to the avenue have been cut off.

Mortals can’t breathe.

For thousands of years, the order is eternal, and only the true immortals overlook the world.

It was not until a modern man who was constantly reincarnated and enhanced his talents came and discovered the mystery of this world that the world was turned upside down!

Let’s see him walking in history, exhausting time and accumulation, breaking this eternal order, and shining brightly.

Going against fate and killing immortals is on the way!

- Description from novelbuddy