MTL - History’s Number 1 Founder - ~ 1432. One person encircles many people!

As if it wasn’t enough for me to be reincarnated as a child in the slums, I was taken to a city of crime and became a test subject. But then, when I saw the man that came to destroy the research institute, I realized that this was the world of an angst-filled reverse harem novel.

While living a relatively normal life after escaping from the institute, the heroine of the novel moved in next door. From the looks of it, I might be the heroine’s neighbor extra. Originally, the heroine was to save the unconscious and fatally wounded villain and in return, be subject to a fanatical obsession.

But, why. Why is the sub-villain collapsed in front of my house?

The sub-villain, Lakis Avalon, was the king of the underworld and the very same frightening man that I had met at the institute before.

“…”

I took a moment’s glance around then I kicked the man’s body away.

You’ve got the wrong house, Villain.

After her parents had both died in an accident, she had to sign an agreement with him to save her family's company.

It was stated in the agreement that he would save her company on the condition that she would allow him to do whatever he wanted with her.

Just because she resembled the woman he had once loved, he had toyed with her a million times and tortured her in every possible way.

He humiliated her in front of others and then abandoned her. She had loved him, but had suffered.

It wasn't until the agreement expires that she finally ran away from him. By the time she left, she was already pregnant.

A few years later, she brought her adorable child back and became strong and cold-blooded. When they met again, he doted on her so much …

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?

Long Fei, a cross-timer and doujin, is an otaku who traveled to another world. In the original world, he was an otaku fan of Gundam and military science fiction.

He died in an accident and was reincarnated into another world. The Gundam works he had read before his death and the techniques in various military novels could be brought to another world.

How would he use the Gundam that Long Fei created? What waves can be caused in this different world?