Legend of Swordsman - Chapter 6420 - : You Tricked Me!

He is a young man without a spirit root. It is believed that this denies him the chance at cultivation. However, a mysterious lady imparts a Supreme Demon Classic to him and from then on, he starts his path of cultivation.
He undergoes a total transformation to emerge as the most fearsome and powerful fiendish demon in his era, that even immortals and fiends are fearful of him, and saints are at his beck and call.
Mastering the Supreme Demon Classic is the turning point in his life. He is able to unleash his immense and divine power from within, illuminating the entire universe!

- Description from Novelupdates

This was an era where everyone could experience various worlds through simulations.

When everyone reached 16 years old, they would receive a Life Lantern, which would grant them two free simulations.

During the free simulations, they had to break through the limits of humans in order to attain a bright future in reality.

Otherwise, they would lose their Life Lanterns and they would slowly be corrupted by a black fog until they eventually died at a young age.

Lin Qiye, who transmigrated to this era, failed his first simulation.

During his second simulation, by chance, he acquired a permanent SSS-rank talent – the Deduction of Genesis.

Lin Qiye’s first life: [When you were two, you had a sudden illness, causing you to have a deformed head and low IQ. When you were 15, your parents passed away. When you were 18, you died of an incurable disease.]

Lin Qiye commanded, “The Deduction of Genesis, deduce for me a way to transcend this life.”

[Congratulations for defying the heavens and successfully changing your fate. You acquired S rank in your evaluation. Your rewards are…]

…

His second life: [When you were 15, the spiritual aura on Earth rejuvenated. You did not awaken any talent while your childhood best friend achieved outstanding attainments with her awakened talent. When you were 16, you were killed by a stranger.]

Lin Qiye summoned, “The Deduction of Genesis!”

[You carefully made plans before the spiritual aura rejuvenated. Because of this, you defied the heavens and successfully changed your fate. You acquired S rank in your evaluation. Your rewards are…]

Existence was divided into three realms. The Heavenly Realm. The Earthen Realm. The Infernal Realm. Below them, countless minor realms of all types existed, none able to match the might of any of the Three Fundamental realms. The Celestials led the Heavenly Realm, The Immortals led the Earthen Realm and Demons led the Infernal Realm while the Rulers controlled all the minor realms. Together, they formed The Myriad Unity and allowed peace to reign supreme. The mortals were allowed to cultivate and reach for the Heavens as a balance was installed between the Heaven and Earth, all according to the Heaven’s Will. And yet, among the billions of trillions of living beings within the Myriad Unity, one seemed unsatisfied. “They are lying to us.” This man went against all known truths and contradicted the very gods. “We are in a false world! Mere pawns used to study an outcome!” And so in search of freedom and truth, this man committed the ultimate taboo. He rebelled.

The moment when mercenary leader Kwang Hwi receives video game like abilities, the world is suddenly thrown into chaos. A thick fog envelops the Earth, bringing with it savage, otherworldly monsters. At the same time humanity has been rendered defenseless against this onslaught, as the strange fog turns most weapons to rust. With mankind spiraling towards oblivion, it is up to Kwang Hwi, with his new abilities, to save the world. Watch as Kwang Hwi leads his militia and becomes the last bastion of humanity. Will he be this world’s savior, or its conqueror?