The Twisted Obsession - Chapter 44: The Harrisons

A young man who had longed for stories of good and evil since childhood lost his life in a tragic accident and was reincarnated as a boy named Chrono Mak in another world.

He learned that in this other world, there is magic and witchcraft, and depending on how you train them, you can become as strong as you want to be, so he decided to become the strongest demon king in order to recreate the story of justice and evil he once dreamed of.

In countless worlds, mysterious doors appear, leading to an ordinary-looking convenience store. That is, until you see who’s inside.An immortal cultivator ponders over instant noodles flavor, an ancient demon sips a cola, and a primordial beast carefully holds a bag of potato chips. Beings who could shake the heavens stand quietly in line, waiting their turn.At the counter, a young man scans their purchases. No one knows where he came from, but all understand one thing. In this store, rules must be followed.Welcome to the Dimensional Convenience Store, where even the greatest existences must check the price before they buy.

mc gets transmigrated to Fallout New Vegas with the merchant system. let the questionable adventure begin.

Xia Zhijun got the title ‘study god’ after scoring first place in the whole city. He’s the model of a good student in a teacher’s eyes: good grades, good manners, and quiet. When he wasn’t smiling, his entire body emits a cold abstinence aura. The girls only have the guts to look from afar and not get close.
Later, it was rumored throughout the entire school that even the study god would fight and hit on girls. Whoever dared to provoke his girl, he would teach you how to be a person at every minute. The night of the graduation ceremony someone saw him blocking Gu Siyi in the corner. He didn’t stop kissing even when she cried. He bit her lips and said in a raspy voice, “I’m going crazy…”
During college finals, Gu Siyi almost bursted out crying, “I’m such a failure. I won’t be able to find a good job in the future…And if I can’t find a good job, I can’t provide for myself…”
Xia Zhijun played with her pink earlobe and remarked, “I’ll take care of you.”
After they graduated, Xia Zhijun created a research company and Gu Siyi became the boss’s wife.
The commercial rocket, “Star of Siyi” was successfully launched. So everyone knew that the new technology superstar, Xia Zhijun has a wife who he spoils a lot.

- Description from Novelupdates