MTL - Rebirth Daughter Against the World - Chapter 9 not very scientific

[Wsa entry.]James Dohan, a famous author working for the government, suddenly died after an accident occurred at his workplace.Nothing could have prepared him for the events to come.[You have reincarnated.]James soon found himself reincarnated into the body of Jared, the son of the village's elder in a demon-infested wasteland.The North, abandoned by a cowardly kingdom after a brutal war, crawled with monsters and desperate survivors. Jared left to save his father with a miracle cure, but James arrived too late—the Elder was dead, the village was starving, and the title of Elder fell on his unprepared shoulders.Luckily, he had a cheat code to rely on.[You have awakened your Infinite Item Shop System.][Current balance: 0 Sp. Buy everything, Sell anything.]Jared found a way to save the people of his village from dying from their own weakness and the horrors of the world.[You have gained 50 Sp.][You have purchased a pistol.][13 Sp has been deducted.][You killed a Dire Wolf.][150 Sp has been added to your account.][The villagers' loyalty to you has risen.][You have earned 300 Sp.][You can now convert this world's money into Sp.]With this system, Jared was more than ready to conquer the North, money, power and women.

Xue Xi is forced to fall in love at first sight with this dangerous man on their first meeting. With death being the only other option, she makes the first move:

“They say the eyes are the window to the soul.”But what if your soul isn't human?Yuki always felt different... too quiet, too distant, too aware of things that shouldn’t exist. But when a strange voice calls him kitsune under a moonlit sky, his world shatters.Awakening powers he can’t control, chased by shadows from a forgotten world, Yuki is thrown into a realm of spirits, mythic creatures, and ancient war.As his true nature begins to surface, so do enemies... and allies... with secrets of their own.This is the beginning of his awakening.And the mythos has only just begun.

They called him useless. A Class E farmer in a world where strength meant survival.Betrayed by the woman he loved, beaten by a power-hungry King, and left to die like trash, Isaac thought his story had ended.But death was only the beginning.Beneath the earth, sealed for thousands of years, a forgotten being awakens, an ancient force of ruin once feared by angels and demons alike. When Isaac agrees to its desperate offer, he doesn’t just survive… he becomes something else. Stronger. Colder. Hungrier.Now reborn with a forbidden power that rejects magic itself, Isaac walks the line between man and monster. Each time he unleashes the Abyssal Overdrive, his strength grows, but so does the Corruption threatening to devour what’s left of his soul.To protect the innocent, he must become the very thing they fear.To destroy the kings who shattered his life, he must embrace the darkness within.Enemies will fall. Secrets will unravel. And when the kingdom of Carreon learn that Isaac is still alive… it will already be too late.The world shunned him. Now, it will kneel.