The Strongest Conquest System - Chapter 6: Exponential Growth?

On modern-day Earth, An Lin seems to have been abandoned by God.
When his father suddenly disappears, An Lin is left with his father’s immense debt, putting his life at risk.
After being forced to a rooftop by his pursuing creditors, An Lin is unexpectedly swept off his feet and brought to the ground safely.

When an S-class elite assassin-raised captain of a special ops suicide squad comes home from a high-stakes Africa mission, he finds himself offered something that could potentially set him up for life- a curious assignment that he could use to finally exit his days of war and slaughter.

Then placed into a high-school setting, Lin Yi is tasked by the chairman of a top-tier multi-billion company with bodyguard duty for non-other than his own daughter, a certain little Miss of said high-school.

His enemies, once ranging from drug lords, mafia bosses, political figures, and national leaders, are soon replaced with spoiled kids who happen to have rich papas and mamas, and Lin Yi finds his intense expertise and high-threat skillset misused, and very underwhelmed…

But he does get a harem cast as diverse as his old enemies, so Lin Yi decides that, for the sake of messing around with girls as an invincible entity in a down-leveled environment, leaving his bloody and death-filled war days behind is something he’d definitely want to strive for.

- Description from Novelupdates

A novel revolving around being transported to another world with an op system. The mc spends his day chasing skirts and doing missions to level up. A standard journey to the top with lots of girls from various animes and games with a twist of that gaming feel (hunting mobs, doing missions).

The world is under invasion by creatures from another world. Martial arts became the most important skill in this world, and all cultivators strived to improve their skills.

Chen Yiming transmigrated to this world with a special ability – the Martial Arts Talent System. The system allowed him to use Skill Points to enhance his talents infinitely.

What if he was born with a physique that was not suitable for cultivating martial arts? He could slowly train in the mountains while waiting for his Skill Points to accumulate. When they reached a certain amount, he could use them to enhance his talent and automatically acquire the physique needed for cultivation.

What if he did not have the complete volume of the martial arts technique he practiced? It wasn’t a problem. With sufficient enhancement to his talents using Skill Points, he could automatically deduce the missing parts in the book.

With the Martial Arts Talent System, he could defeat everyone who got in his way. He could easily climb the ranks in the martial arts world – becoming the top disciple, the top cultivator, then the grandmaster.