The supporting character's harem is very normal - Chapter 230 The Count Title

In the winter of Taikang Year 3, a girl pays a visit to her future in-laws, the Ning Family of Beiliu, Yangcheng.

After her engagement was denied, the girl decided to hang herself in front of the Ning Family to show them her sincerity.

When the girl who had died opened her eyes once more, many people’s fates were changed forever.

- Description from Novelupdates

Lou Yao Yao wasted her life fighting over a man, only to find out he wasn’t worth it in the end. Because of this man, she accidentally killed her rival in love, and even ruined the man who had always been watching over her.

Getting reborn as her 20 year old self, there is still time to fix everything. Lou Yao Yao decided to live as a genuine vicious woman. After getting her hands on the loyal like-a-dog man, she would show that cheating couple what pure loving affection looked like.

- Description from Novelupdates

The Capital’s girls look on with hatred, “ You’re just a country girl without any knowledge. Do you have Niyun Shop’s clothes? Do you have Brilliant Treasure Pavillion’s jewellery? Do you even know how eminent and domineering the famous Yue Wang is?

Mu Yunyao looked at them lazily, “ Niyun Shop? I opened it. Brilliant Treasure Pavillion? I opened it. As for Yue Wang…when are you returning my silver?”

Yue Wang’s face was cold: “I will pay with my body.”

(Wang means King. In this case, “Yue Wang” was a title given by the Emperor to his son.)

After being reincarnated, Mu Yunyao believes in three things: One, do not have good intentions towards others. Two, do not let the enemy have the chance to rise again. Three, do not believe in feelings. Thus, she is merciless. She is fearless. She would rather have everything destroyed than to compromise for everything.

However, after one fateful meeting, a cold-blooded prince keeps following her, silently plotting on making her his wife and bringing her back to pamper her…

- Description from Novelupdates

Emily spent the last three years dying slowly in hospital beds, her brilliant silver tongue trapped in a body that didn't work. Her only escape? A spicy life sim called Queen of Hearts.One day, on New Year's, Emily dies as she gears up for another playthrough. But death, it turns out, is only temporary.She wakes up reborn inside Queen of Hearts, as her player character! Except this time, she isn’t clicking options on a screen. This time, she is Aegis Starcaller, a commoner nobody with silver hair, purple eyes, and a body that can finally move… and real, tangible ladies to seduce.Armed with copious amounts of meta-knowledge and a divine fertility blessing that makes every conquered love interest feed her magical power, Aegis sets her sights on Rosevale Academy, where she will build the life she never got to have on Earth.... And seduce everyone she can, while she's at it.---Yuri / Futanari harem story with a Futa MC! | Isekai Power Fantasy | Rags-To-Riches | Updates Daily!