The supporting character's harem is very normal - Chapter 328 Thank you, Akna.

“P-please let me go..” I stammered and before I knew it, I was word vomiting while crying. “—I won’t return. You won’t ever see me again. I know you don’t want me as a mate. You hate me, so please let me go.” I cried out.Cain’s jaw tightened with each word that left my lips “What gave you the idea that you have the power to choose what you want?” His voice was low, “You don’t get to decide what, how, and when you leave. Only I get to do that. You don’t get to leave me, you don’t get to run! You only leave when I want you to.”“I didn’t ask for this,” I whispered, trembling. “I didn’t ask to be your mate.”Cain stepped back, “Neither did I,” he muttered under his breath. “But the bond doesn’t give us a choice, does it?”~~~~As the only child of her late Alpha father, Avery Jae was meant to inherit her family’s legacy. But on the day of her arranged marriage to Alpha Lucian, her world crumbles. Rejected, humiliated, and cast aside for her own cousin, Avery barely escapes with her life only to find out a much deeper secret. One that changes everything.When Avery awakens, she finds herself in a foreign land, caught by the ruthless guards of the Vehiron pack, led by the infamous Alpha Cain. Tall, broad and as dangerous as the army he commands.Alpha Cain has a reputation that sends chills down the spine of even the most dangerous warriors. Haunted by his dark past, he has vowed never to take a mate, yet the moment he lays eyes on Avery, everything changes.With a single word, Avery is bound to Cain—whether he wants it or not. In a world where betrayal runs deep, can Avery ever trust the alpha who might just be her worst enemy.

Three reincarnations. Fourth life.

She was chosen to grow up as the Child of Fate; but when the real Child of Fate appeared, she was sacrificed for that child.

In the second life, she was abused.

In her third life, she lived as a beggar.

“This country is not safe. Let’s defect!”

LeBlaine chooses to be re-born into a new family to defect. The family she chooses is…

… the family of the future biggest villains in the Kingdom.

“Let’s try to get along until the time of my exile!” is what she tried to do. But what happened was…?

“My daughter is the cutest IN THE WORLD!”

“Give me that building, I can use it as my sister’s bathroom.”

“Don’t worry, LeBlaine asked me not to hit you. Not to not kill you.”

“WHO, WHO MADE MY SISTER CRY?!”

Zhen Zhen was reborn in the forest area in the 1960s with a drop of the blood of the ancient gods. The awakening of the blood of the gods not only gave Zhen Zhen one power after another, but also made her the most favored little lucky star in the family!

- Description from Novelupdates

You had taken up the Student profession

You had now reached level 7.

Acquired skills: elementary school knowledge, junior school knowledge, and senior high school knowledge.

You took the university entrance exam and scored full marks.

Your have been upgraded to level 9, and you have activated the profession-change interface.

You became a scientist and gained R&D skills.

You used R&D skills and gained space fortress-building technology.

You used R&D skills and gained starship technology.

You are now invincible.