The supporting character's harem is very normal - Chapter 9: Going to the Karol Empire?

After transmigrating, Chen Yu found himself in a highly militarized world. But the “will of the world” had concluded that he was an intruder and put a curse on him.

Reincarnated into the Douluo Continent, inheriting the Emerald Scorpion Martial Soul, with no other options—what should you do if you’re forced to play with poison? Chen Ming declares: “If I’m going to play with poison, I’ll make sure to excel at it. As a transmigrator, even playing with poison, I’ll set an example worth following.”(Anti-Tang San, multiple female leads, no affiliation with the Spirit Hall, self-created divine position.)Raw Title: 斗罗：翡翠毒皇

Levelling up?Gods System?After dying from overwork, Harry awakens in a world where humanity fights for survival against relentless alien invaders, each person’s fate determined by a power they awaken on their tenth birthday.With his own tenth birthday looming, Harry chooses a seemingly weak ability, a decision that marks him as an outcast.But beneath the surface of this unassuming power lies a connection to ancient gods and a potential far beyond anything the world has seen.Armed with the mysterious System of the Gods, Harry must navigate a world teeming with treachery and secrets, where betrayal lurks around every corner. The alien threat, ever-adapting and evolving, doesn’t rest, growing stronger with each passing moment.As Harry struggles to master his newfound powers, he uncovers dark truths about the origins of the alien invaders—truths that could shatter everything he thought he knew.The fate of humanity teeters on the edge, and Harry’s true awakening is only just beginning.

A young man with an extraordinary mind is off on an exciting adventure when he mysteriously wakes up in the body of a feeble slave-guy in a different, rich in quirks world.

The main character, a selfish jerk, would use extreme means to achieve his goals. However, he never allows his base instincts to overrule his sense of decency. He always pays back both good and bad deeds.

Will his (terrible/excellent) mentality help him make a fresh start? Will he get through misfortunes and hardships of the new world?