From BOSS to Canon Fodder: She is Currently Out of Service! - Chapter 4 - 2: Rebirth in the Age of Mecha

How can there be any invincibility?

How can there be any Xeon undefeated?

No one in this world can be eternally number one, anyone can be defeated.

including me.

I’ve been waiting for that one person to show up, beat me, tell me that my way is wrong.

It’s a pity that that person hasn’t come yet.

…

False martial arts: strengthen yourself, break the limits of the human body, and resist bullets with flesh and blood.

Real martial arts: use the magnetic field of life to dominate the magnetic field of the stars, use the small universe of the human body to attract the power of the big universe, travel the starry sky, and smash the planet.

- Description from novelbuddy

To correct the mistakes of his past, a young man is forced to narrow the space between science and witchcraft, as he ventures on a quest to save his world from complete destruction.

Yeon-woo had a twin brother who disappeared five years ago. One day, a pocket watch left by his brother returned to his possession. Inside, he found a hidden diary in which was recorded “By the time you hear this, I guess I will be already dead….”

A blizzard had raged for ten days, with temperatures plummeting to below minus fifty degrees Celsius.Yet, that wasn’t the most terrifying part. The impending disasters of rat plague, extreme heat, drought, acid rain, tornadoes, and other severe weather conditions would follow one after another, each one a veritable hell on earth.Gu Pan was reborn seven days before all these calamities began. At this time, her Space was still with her, her husband was still alive, and she needed to hoard resources like crazy.Food, clothing, shelter, transportation, medicine, weapons, electricity, and all other essentials of life—she had to stockpile enough for the next lifetime.What? The ‘friend’ who had betrayed them in the previous life was also reborn? And they had hoarded a warehouse full of supplies, even more than them? No more nonsense, just take it all into her Space.After the apocalypse began, she and her husband kicked off a spree of zero-cost acquisition.In this life, they would take revenge on their enemies and settle all scores. Those who had hurt them would be repaid double.