At first he just want to be better than his previous life, but in the way he meet a genius (friend) who challenge him to become more than that. The MC is so humiliated by the genius words and promise he will beat the genius. In that way, the MC way of life change, and he has a new goal. On the way he doing the unthinkable training and face so much hardship and got help by so many people. Then his story as a real magnate begin. His personality as an individual grow more and more as the story goes. No he dont do it himself, he got help by other individual stronger that himself and by their advice, he grows.
The cheat skill is in a way is cheat, but in other way is not. In the past live he dont have 'supernatural' power but in this live he got this cheat skill or cheat 'supernatural' skill. After apocalypse human can become stronger and stronger, and they name it type 1 as the start (already as strong as best athlete) and stronger as the type number goes. The MC growth in his type is strongly influenced by his cheat so he cant advance fast enough as other 'top' zombie killer. But because the cheat also have other function like strength up, agility up etc, because of that he can win against people at higher type. But as the 'type' thing significance power, people always belittle him and always mock him, its kind of become his routine, where they mock him, insult him etc until they attack him, and he mow them all (this happen often).
And of course warning, many people died lol, lots of blood, human parts, and other gruesome thing.
Also for those who is special snowflake you better dont read this before you cry about sh*t, I read some comment who like to comment about sexist r*pe etc in apocalypse theme story, what a snowflake. Many thing doesnt got explain very detailed in the early chapter, and some crybaby already commented about it, pfft what a noob. If all the information is already out in the open its not a web novel idiot, it maybe isnt a story at all, just read, some thing is not explained because there is time to explain it, stupid. I already read to ch 300 so for those who just read only 20 chapter and complaining sh*t about ranking and stuff, its in chapter 100ish, and for the every character background etc its to far off, so many unexplained information, and if you want to know all of it kill the author, you jack ass. What an asshole, give 1 or 2 star rank not because the story is bad, but because he/she is a snowflake and want to know every f*cking thing at the early chapter! I may only give 4, but this wn is doesnt deserve low rank if you cant understand what a story is, jackass. Try to write one if you can, and yes I already try it, so I can feel the rage if some story got stupid idiot comment. If you are stupid just score it dont comment and mislead every other people who never read it.
Some people also commenting about the lack of 'good' people in the story and everybody is malicious, bad etc... well we dont need sherlock to answer him cause this is f*cking easy, its apocalypse idiot. 80% turn to zombies, and if you are unlucky maybe all in your house except you turn into one, so where is those 'good' guy? Dead, definitely dead, those who survive will of course competing for resource you moron, and how to do that? Asking nicely? Sometimes I ask myself why some people with limited imagination and knowledge start to commenting like they sound so smart even though all their argument is full of flaw. And yeah 1 or 2 zombies is not a problem, but 1 bite you turn to become one, and there is not 1 zombies, every person need to fight at least 4 of them (80%), and dont forget the zombies will swarm, try play zombie game, tell me how you beat them, even using a baseball bat is too much energy consuming for each swing and will you swing another 3 zombie will probably swarm you to death.
Also about the r*pe thing, human instinct remember, the one who become the leader always the strong one, and how many of those strong people is a good guy? Most 'good' guy is weak and they use money or law to influence people to also become good in society, have you ever see strong man politician, maybe 1 in 50. Most strong guy is not so nice you know, especially in country like China, so of course that most of the leader is bad guy, and how to release their stress? Basic need, food, place, and woman, if you dont know this maybe you are a sissy or woman. Also in later chapter there is a good guy, just not in ch 66, actually there is many good guy who become leader, if I count maybe almost half is 'good' guy who dont r*pe woman in first glance. Also another reason why so many bad guys is maybe can be explain by this quote 'In the worst situation people will show their ugliness', basically apocalypse if stressful, using percentage 4/5 of people you know is not alive and want to eat you. And those alive is also 'potentially' zombie in the future, think about that Rorrim. Think with your head next time.
He start in the some dumpster planet, meet OP machine, train, got away from the planet, go to another place, meet other people stronger, train, kill, train again, go to another place, learn many things but not common sense, smart but stupid at the same time, got chase away, go escape, train, meet new people. There its the summary of first 200 chapter, full of bs anyway. But if you can still read until that maybe its good for you, the rest is not much.Make a team, fight strong power, got away, trap in strage shit, got away, meet strange tribe, help them, become OP organization, after that pretty much kill anyone in the way. Oh yeah this last spoiler is the ending, dont read if you want to enjoy the storyThe MC is actually a secret kid with bloodline of super power, but doesnt know that, and he become the savior of the humankind by kill monster who kill 3/4 human in all galaxy. By killing it he become the savior duh, and they 'forget' all his past crime of killing spree, very logical yeah?
MC is very diligent magician but no talent whatsoever, and become so sad and angry to his own talent until the legendary grimore appear because the grimore sense he have so many greed/glutton for knowledge. After that using the grimore he become more and more stronger and help so many people, become important figure and of course fight so many impossible monster and enemy and keep growing. Also the grimore is alive and have personality so he can think and sometimes give advice, but their relationship is like mutual symbiotic that help each other. And so their journey continue to eat more books? Dunno about the real intent of the MC, he just a very kind and want to help people but the situation always make him fight, which in most case because he is the one who make it happens, and many case because author logic meh (coincidence).