Kyoukai Senjou no Horizon - Volume 8A, Chapter 8: Regretters on the Hill

With a marriage contract forcefully done, he married her, and all she could do was comply, and resent him deeply for that and for all the following misunderstandings they faced.
However, it was already too late when she understood she actually loved him.

I struggled until I was thirty-eight and couldn’t afford a house. I had to pay a gift of three hundred thousand in advance to get married. I lived frugally and frugally for most of my life until my liver was broken. But where was the money? Who made the money?

Jiang Qin, who harbored countless grievances, was reborn at the age of eighteen. The only thought he had when he opened his eyes was to start a business and make money.

The first step is to snatch back the love letter you sent, turn it over, and write three lines in the school belle’s astonished eyes:

You can’t work for anything, and you can stay with a rich woman if you can.

You can make more money if you lose it, but you can make more money if you lose your conscience!

Social animals, never slaves!

As for love? Dogs don’t even talk about that stuff!

- Description from novelbuddy