The supporting character's harem is very normal - Chapter 251 Miconia – Commercial Association

The world was once at war with 10 alternate worlds. This was known as the Concept War and our world won 60 years ago. All of this was concealed so no normal people are aware of this fact in the current time.

After the death of his grandfather, the high-school student Sayama Mikoto is suddenly summoned by the giant corporation IAI. He learns this world is headed for destruction due to the acceleration of the Minus Concepts. To prevent this, negotiations must be undertaken with the survivors of the other parallel worlds so their 10 concepts can be released.

And so Sayama is caught up in the final battle to clean up after the Concept War which left behind so much enmity.

A mysterious youth who came from a mysterious village, didn’t have the Heart of Tao. Nor did he have the Tao Spirituality nor an unblocked Tao Physique.

However, even in such a situation, he had his heart set on Tao and submitted himself to the Seeking-Tao Sect as a disciple and stepped on his way, an unusual and unique way to Tao cultivation!

- Description from Novelupdates

Xu Jinzhi lived a healthy life until she was seventy-five, passing away without much suffering, and seemingly without any major regrets or dissatisfaction.However, looking at her son, daughter, grandchildren, and great-grandchildren beside her bed, Xu Jinzhi couldn't help but think of her late husband who died young in an accident, wondering if she would be able to see him again—if only she could.Upon opening her eyes next, Xu Jinzhi shockingly finds herself transported back several decades in the past, at a time when the Xu and Xie families were negotiating a business marriage. Without hesitation, she mentions the name 'Xie Yanchuan.'In her previous life, marrying Xie Yanchuan was a reluctant choice, but in this life, she chooses him decisively!The Xie family holds significant influence in City A, Xie Yanchuan, however, is the overlooked member of the family, overshadowed by his older brother carrying familial responsibilities and a younger, frail brother.This setup doesn't bother Xie Yanchuan much; he is content with living quietly.One day, the marriage arrangement with the Xu family lands unexpectedly on his shoulders, resulting in his marriage to the woman named Xu Jinzhi!Xie Yanchuan initially prepares for a marriage of mutual respect or non-interference. However, why does Xu Jinzhi always surprise him with her unexpected actions?

In the Tranquil Sun province of the empire, there exists an unremarkable lordship known as Xue Ying Territory! This is the home of the Dong Bo clan, the clan of our hero Xue Ying!

His father, a commoner turned noble; his mother, a noble who abandoned her clan for love, and his brother, an innocent toddler. But peace cannot last forever, Xue Ying’s peaceful life is shattered, and the only way to reclaim it is through power!

- Description from novelupdates