MTL - Cult of the Sacred Runes - Chapter 2 Wake up at dawn

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

The youngest Wiseman of the continent, Chu Tian, has traveled 30,000 years back in time to the age of antiquity due to an accident.

Hunger, poverty, and death are the inevitable fate of those who live within the mist, a territory dominated by monsters where sunlight never reaches. With only one eye and missing an arm, daily suffering was all Lily could expect. In a world where the strong rule over the weak, she faces aggression and abuse every day, learning in the harshest, most painful way that kindness doesn’t exist.However, everything changes when she encounters a sentient metamorph, a nameless monster, wounded and abandoned by its pack. Together, they discover that perhaps they don't have to face this cruel world alone. Now, with a companion willing to risk everything to protect this bond, Lily, the girl who had lost everything, finds a new reason to live and fight.

When Ye Mo suddenly woke up, he realized that everything around him seemed to have changed: He has been transmigrated into the modern Earth where spiritual energy is scarce. His pretty master from his former world was nowhere to be seen. Most importantly, he found himself in the body of a young man who has been abandoned by his clan for an embarrassing reason…