The supporting character's harem is very normal - Chapter 529: Kill him!

“Titus Zane, since you've done it, you have to bear the consequences!”At the engagement banquet of childhood sweethearts, Titus Zane is drunk.Sitting on the fourth-floor viewing platform, watching the man approaching step by step, she says, Nathan Moore, let's make a deal. If I jump from here and don't die, then let me go...Fine, his emotionless response was a single word, displaying his ruthlessness.Titus Zane smiled, the curve of her lips beautifully tragic and dazzling, slowly spreading her arms, her body leaning backward, leaving only an empty wine glass and a woman's shoe on the platform.Later, someone tells Titus Zane that the mother she trusted most was not her biological mother but a mistress who usurped the position, and the murderer of her biological mother... When the secret is revealed, Titus Zane discovers that her mother's kindness was merely a ploy to obtain her healthy heart...Note: The main characters in this story are emotionally and physically pure. It's a story of torment followed by love, feel free to dive in.

I am Master Siwei, and I speak for arcane arts.
This is an era of heroes and heroines.
This is an era of great changes.
In the end, it will be an arcane era opened by me.

- Description from Novelupdates

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

HE WAS SUPPOSED TO AWAKEN A POWER. INSTEAD, HE AWAKENED NOTHING.Louis Lee is the son of two legendary Earth Defenders, but when the superpower evaluation test reveals that he's powerless, his world crumbles. Mocked, abandoned, and broken, Louis becomes a target in a world where strength is everything.But fate has other plans.When a devastating alien invasion shatters the city, Louis is abducted by the same monsters that once killed his parents.Subjected to a brutal experiment, Louis is implanted with a living alien core, a weapon to annihilate humanity at once but instead the core grants him incredible powers making him, half human and half monster.But now, Louis is Earth's only hope of defeating the invaders, but the more he uses the core, the more it mutates him, transforming him into something far more scary.