I Can See Your Combat Power - Chapter 172 - One Hundred and Sixty-Eight:

He Lang died by his own hands for the sake of his imperial younger brother’s ambition, whom he loved. He was offered to be reborn in exchange for giving up his past romantic feelings. Reborn without the burden of his romantic feelings, he brings with him a manual to new worlds. He wholeheartedly followed the instructions of the manual to complete the tasks, not knowing that the originally slag gong was blackening…
He pleaded to his affectionate Emperor brother to release him, he pleaded to the paranoid prisoner next door, but until the end he remained baffled.
In the end, he discovered that the full name of the manual was – “Slag Shou Cultivating Manual”
Σ (っ ° ° °;) っ!

- Description from Novelupdates

Lao Chen was just an old, underpaid security guard in a rundown apartment complex, living a miserable life under a stingy, ungrateful boss.His wife left him, his daughter wanted nothing to do with him, and poverty was his only constant companion.In the end, death came in the form of a drunk driver, leaving him broken and forgotten on the cold pavement.But fate wasn’t done with him. In his final moments, he prayed—desperate, pleading to any deity who would listen.And someone did.The God of Wealth and Love took pity on his wasted life and granted him a second chance.Wake up again as Zhao Yiming, a 25-year-old gambler and alcoholic drowning in debt with nothing but a good face and a strong body to his name, he was given the Affinity Money Maker System—a mysterious power that let him gain wealth and influence by forming relationships, whether as lovers, friends, or even enemies.Before he knew it, he had stumbled his way into unimaginable riches.But things never go as planned. One moment of recklessness—one affair with the wrong woman—led to an unexpected murder.Now, the system has thrown him onto a new path: The Villain Route. With a negative perk that keeps the police off his trail but tightens the noose around his future, Zhao Yiming is faced with an impossible choice.Will he claw his way to the top and become the billionaire he was meant to be? Or will his second life end behind bars, just as tragic as his first?

The world experienced a cataclysmic change, and countless spatial gateways appeared out of thin air.

A former sporting rifle shooter genius transforms into the ‘Juvenile Butcher’. While originally supposed to have received the death penalty, he was instead fortunate enough to have entered a secret and highly regarded armed force, throwing himself into the ‘Nirvana Project’.