The Herb King - Chapter 38

Being able to see into people's past has no real appeal for the teenager this story is about, letting him use it only as amusement and to show off when he was drunk.Never watch into someone's past beyond a superficial level.Never try to find out more than you should.NEVER. EVER. LOOK. INTO. THE. FUTURE.But everything changed the moment he was forced to look into the future, was forced to investigate a murder, and was forced to make the acquaintance of the victim's twin brother('s fists).The more time passed, the more it appeared that the primary reason for this murder wasn't a local problem, but a global one.This single, marred corpse was the beginning of a threat that would shake the world.(MC looses a screw when he enters the prison)BL, first-person view; MC is shuo (perhaps even a reversible couple); love interest falls in love first; both MC and ML are straight, mutual bending, Enemies to Lovers

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

Gu Yang crossed over to a high-martial world, eked out a living in small village for two years, and finally saved up enough and activated the Life Simulator system.

With a certain amount of money, a simulation can be run.

After the simulation ends, one of the three can be retained: realm, martial arts skills, or life wisdom.

[For five years you were an accountant, saved up enough money to buy a cultivation manual, practiced hard for ten years and became a Ninth Realm martial artist, but then ran into an enemy and died!]

[Once you left the mountains, you were at the Ninth Rank, became a protector of a certain family, practiced intensely for twenty years, broke through to the Eighth Grade, and ultimately, died of old age in a small town.]

[Once you left the mountains, you were at Eighth Grade, received recognition from a noble clan, were taught profound martial arts, but due to slow progress, were marginalized, and after a dozen years, you finally broke through to the seventh grade, but then encountered powerful foes on a mission and were killed.]

…

After countless rounds of simulations: [You encounter people, but none are a match for you. You realize that you have become invincible.]

……………………………………………………………

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A useless prince, yet brimming with kindness and compassion—his smile as warm as sunlight, illuminating this darkened era.But that was merely a mask, hiding the poisonous and mad nature beneath.A monster lurking behind a gentle shell.A system that feeds on stolen Heroines.He will outplay destiny—and rise as the world’s ultimate villain.