My Seatmate Tries to Make Me Fall in Love with Her by Teasing Me Repeatedly, but Somehow She Was the One Who Fell - Chapter 55: Intelligent Yui

This story is about a god level player, Li Cangyu, who returns to the game Miracle after being away for several years. The story explores him playing the game and setting up a team in an attempt to finally win a trophy in the Miracle Professional League.
E-sport God Series 1 “The Strongest God”
E-sport God Series 2 “God Level Summoner”
E-sport God Series 3 “The King’s Return”

The world that nurtured the civilization which reached the pinnacle of magic was on the verge of destruction.
The last survivor transmigrated to the past, when the magic civilization started growing, as countless mages were still fumbling their ways through the thorny paths of magic knowledge.
He, who came from the end of the magic era, aim to reach the pinnacle of magic.

- Description from Novelupdates

The undisputed greatest doctor in Korea, Baek Gang Hyuk.

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