MTL - For My Sister, I Became the World Boss - Chapter 433

Sometimes dying isn’t even the worst part of your dayMark has been reincarnated into a dead town in a bog, one that has been recently destroyed and occupied by ravenous undead. They disappear every day and return again at night, mindless and hungry, hunting for any survivors. He’ll need to use cunning and subterfuge to avoid them, because since he was transported into the body of a child, he can’t level up. At least not yet.Bog Standard. It means “totally normal”, right? But for the small towns found in these bogs, there's no quick rescue and not much trade. Everything has to be made to last. To them, it means “excellent quality”. Mark will have to prove he's Bog Standard if he hopes to survive.This is an Isekai of excellent quality. It’s a progression fantasy set in a LitRPG world, rags to riches with an eventual OP main character. The pacing is slow-burn, incremental progression, sometimes slice-of-life, punctuated by moments of intense violence and possibly traumatic content.

The mountain village boy accidentally got the fairy gourd, and he rose step by step to cultivate immortality and longevity.

Ripe elixir, mortal flow.

- Description from novelbuddy

In a world fraught with innumerable dangers where living day by day is a struggle, a young man from the modern age transmigrated into such a world, accompanied by a peculiar system made for assassination.

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