There's not really anything new here. The writing is typical of this genre, meaning it's pretty much just shit tier. The only thing mildly redeeming about it is how honest the author is about the MC not being a hero or even anti-hero. Even the MC's tendency to just randomly do seemingly heroic things is explained as the protagonist just wanting a cheap feel good moment. The protagonist is literally just some scummy average guy with OP abilities and knowledge doing whatever he damned well pleases regardless of whether it's good or bad.
Early on, MC is offered a better deal to go live in the States and he's just like "nah, I'd rather just live in Korea because that's where my mom lives." At no point does he pretend he's actually loyal to the corporation he signed on with, Korea or the Korean government. He just wanted an excuse to live where he was, so he blames his mom. It's the kind of excuse you'd expect from a lazy pre-teen.
If you're curious about how the MC is a bigot, it's fairly obvious early on. The MC himself is even like "my past self was a complete classist dick hole" and mentions how his current self wasn't like that but then basically says "well, they're both me, so it's fine." In a round about way, the MC just plain admits to being extremely classist and that he's fine with it, saying the (physically) strong should lead the weak. However, that's not the only example. At one point, around chapter 115 or so, he straight up enslaves a team of American hunters and, of course, the token black guy says something about how he's never going to be anyone's slave, right before giving into the slave spell cast on him. I always find it ironic when a minority makes fun of another minority for being a minority. It's just so classy.
At some point, the MC casually just casts off being human and is just kind of like, oh well.
The MC also basically just becomes the stereotypical tyrant dictator of Earth, that his previous incarnation was of his previous world.
I'd say it's mildly interesting in a train wreck kind of way but it's too boring to even classify as that. It just feels like the power tripping musings of a bored 12 year old that wishes magic was real and that they could somehow monopolize that in an arms race.