everytime he needs a certain skill or item MC will get it in a few chapters

The MC struggled so much to kill LSJ and ending the game, even though the MC managed to kill LSJ and PSH he still hasn't clear the game yet. The story ended 1 week before MC and all star player go to 9th floor dungeon (last dungeon)

And we were told that he was the top hunting dog in the top organisation meaning he was well trained and he knew a lot of things.

The MC is from the beginning an Immortal Swordsman so not even the big bad Hero can defeat him without resorting to use a sword that lowers his powers by 90% so that a poison that killed everyone else can start to effect him. So when he regresses he decides to pick the necromancer class cause he can't defeat the Hero with his last class. But he still decides to invest all his stats into physical (it's never really explained outside that there are likely two stats magic and physical) because by investing everything into physical stat he will have a chance to fight vs the Hero cause the Hero has so high physical stats that he's a litteral tank. But he still goes with the necro class that has all it's skills based on and boosted by magic. Then he goes on to use the skills and realizes that his summons fighting experience and skills are based on his own fighting style so the weakness of the previous king of necromancer is now gone since he is a fighting expert, every single summon of his is a copy of himself.

He say's he'll revise his build because of this but, still continues to invest all his stats into the physical stat even though magic would make him able to summon more summons and make them stronger he still only trusts in himself. Then the author starts giving him a bunch of high end skills from the start that boosts his summons by a % so the higher their base stats the stronger they get.

To be honest the author seems to want to make a copy out of Solo Leveling but pretty much just makes the MC look s*upid because he focuses only on the physical stat while going with a magic class and over and over highlightning how good the magic stat would be for himself but instead goes with the physical stat which pretty much does nothing for him outside of making him physical strong. Sure being physical strong is good, but being able to summon 100 skeletons that are probably even stronger and has the same fighting skills as yourself is probably even better. But yeah pretty much author wants his MC to be a necromancer while still being a melee fighter and justifies it by having MC invest everything into physical stat cause all the skills, passives what not the other classes have don't matter at all cause the MC has the same physical stat as them and good gear.

Some times it feels over complicated and too evil because it's like there's only very few people doing the good.

And just adding a few elements would turn it into an exemptional novel but still I feel the way this was executed it's very very satisfying.

They don't just immediately side with and serve the MC (and they aren't all good guys). One is a villainous guy who betrayed Korea to Japan in the previous life. MC essentially uses him by pitting him against his enemies. He thinks the MC is working for him but in reality the MC is manipulating him and using him as a shield/distraction (and ripping him off).

Others are people who were his enemies in his first life... but only because they were enemies of the the guy who betrayed the MC (the now main villain). They are a funny and quirky group and I like to see the MC get closer to them (he doesn't just go forever solo just because he was betrayed once).

The MC, with the help of his allies, creates an alternate identity who essentially competes with the main villain in the public sphere. It's hilarious when he uses that identity to trick people, making it seem like he negotiating with him, challenging dungeons with him, selling things to others so they can gift it to his other identity, etc, when it's just him all along! And he does all my favorite things, like plotting against himself with others, attempting to assassinate himself, faking his death, etc.