The supporting character's harem is very normal - Chapter 311 Lathel and Akna

There are 5 books on the 6 sworn brothers in a serial called streamer (流光系列). ‘They are rich, handsome and powerful. These book are on various types of love as well as on the bond and mateship between the brothers. Book on youngest 6th brother.

Chen Yu Bai (3rd brother) & An Xiao Yi – Chen Yu Bai is a sharp, domineering & cool man whereas An Xiao Yi is a foolish, childish & innocent girl. He is her boss & she is his secretary. He bullies her yet at the same time will not hestitate to protect & shelter her. Thus, she can always rely on him. Their relationship is a funny one on how opposite attracts.

Li Wei Ran (5th brother) & Qin Sang – Li Wei Ran and his cousin Qin Song fell in long with Sang Sang who is An Xiao Yi’s best friend. Sang Sang sees Li Wei Ran as a good man. He is polite, patient and passionate whereas she is independent, intelligent and interesting. They are a perfect pair but she is afraid to love so he has to work hard to convince her he is worthy of her love..

Short sequel on their children.

Guo Miao, the national treasure of the Empire, committed suicide after completing a certain grand project. Everyone had theories about her motives, but no one was aware that she was a reincarnation and had simply ended her own life because there was nothing left for her to do. She did not expect to reincarnate back to her past life when she discovered that she was the Guo family’s real rich daughter. In her last life, she did not turn down her parents who came for her, only to find that her decision left her in the abyss.

Not only did her parents play favorites, but their fake rich daughter was also ruthless, framing her for a murder and isolating her, then leaving her to rot in jail while her stepfather died from depression. Now that she had reincarnated, she no longer sought familial warmth—only survival for the sake of those who truly loved her and to live her life! She earned countless honors and innumerable scientific discoveries by turning over a new leaf.

Everyone who used to belittle her now regretted life, bawling as they begged for her patents. She coldly watched as they humiliated themselves and snapped at them icily: Dream on! In this secular world, she was the goddess to all and the most coveted person of every rich kid in the Imperial Capital. A certain man: The proudest thing I’ve done in my life is winning her love!

At the age of 12, Shen Yue accidentally fell into a pond while feeding fish. That’s when she realized that her parents were not her real parents, and her five brothers were not her real brothers either. She was just a fake heiress to the Shen family!

Knowing she was destined to lose everything, Shen Yue decided to just lie down and give up. If she was going to lose it all anyway, she might as well just lie down and relax.

“Big brother, is working at the company fun? Let me check it out,” she thought, wanting to enjoy the perks of being a Shen daughter while she still could. Those luxuries would be out of reach soon enough.

“Second brother, is acting fun? Let me give it a try,” she schemed. What? They pay you just to lie still like a corpse? This is a job she had to get!

“Third brother, is that gun realistic? Let me see,” she said, examining the firearm. Not bad, though the recoil is too strong. She’d need to find a smaller one to play with next time.

“Fourth brother, will the teachers be mad if I sneak into your research institute? Let me take a peek,” she plotted, eyeing her handsome professor. A little hugging wouldn’t hurt!

“Fifth brother, that medicine you’re working on smells nice. Mind if I try a little taste…” she asked casually before sampling it. Tastes good! But now my head feels itchy—I better not be growing a brain!

On the day the real heiress returned, Shen Yue’s five brothers shielded her behind them. “Dear sister, can we keep her with us? She’s a bit slow, it’d be dangerous for her out there alone.”

The true heiress scoffed coldly, masking her sly intentions beneath a guise of innocence.

But in the end, she realized this Shen Yue really was quite dim-witted. Oh well, might as well let her stay.

The little handsome son-in-law passed through a world as waste material and the husband of a wealthy family. But because of his lacking aptitude, the wealthy family had driven him out. So he worked hard and found a more powerful family’s thighs to hold onto. Soon enough, he became the strongest son-in-law and husband in history.

In this world, it was impossible to practice martial arts. It was futile so he might as well take advantage of his wife’s thighs and maintain a comfortable and leisure lifestyle.

He’ll train his wife to become the strongest and best person in the world.

“Whoever dares to provoke me, let my wife kill you!”

- Description from Novelupdates