The supporting character's harem is very normal - Chapter 7: F rank talent…

In her last life, Jiang Changning discovered that she was a fake daughter when the real daughter she had never met came to meet the family. Because of Jiang Luojin’s schemes, everyone’s treatment towards her in Hou’s mansion turned bad.

Mother Jiang: You are the one who caused my A Luo to suffer so much!

Brother: A Luo is your younger sister, what’s wrong with leaving the marriage to her? You owe her all this!

Fiance: The only one I love in my heart is A Luo, and it’s all because of your wishful thinking, Jiang Changning, you will never be a humble person!

The betrayed Jiang Changning died on the day Jiang Luo got married.

Once she woke up, she found that she was back in time when Jiang Luo came to

introduce herself. And she suddenly can hear the conversation between Jiang Luo and the “system”.

The other party has been robbing her luck through this system!

The only thing that can counterattack this is the Banquet King who saved her in her previous life!

So…

Banquet King: What are you doing? Stop hugging my thigh!!!

Jiang Changning: It’s just… very comfortable!

- Description from Novelupdates

Traveling through the world of One Piece, Ron, who became Kuina’s fiancé, awakened the god-level theft system.

In order to become stronger and change the fate of Kuina’s death, and to survive in this dangerous era of great pirates, Ron started to steal Sauron’s top kendo talent.

And that’s just the beginning.

In order to become stronger, Ron embarked on a journey to steal the talents of the world’s strongest.

“Ding! Congratulations to the host for stealing Karp’s physical talent!”

“Ding! Congratulations to the host for stealing Nika’s talent!”

“Ding! Congratulations to the host for stealing Shanks’ domineering talent!”

“Ding! Congratulations to the host…”

- Description from novelbuddy

I fell into a game world out of nowhere with an instant kill skill.
And then somehow, I became a bigshot.