I found it ridiculous how he eventually became OP enough to start waging wars against countries that does him wrong, and that the government did nothing more than asked for the blue prints to his transformer Land Rover. (눈_눈) I also did not like how when the underworlders appeared and MC found out that they were able to self generate the energy stone he wants (life stone for the underworders because it was what gives them a quality of life. They wouldn't die without it but they wouldn't really live either), MC traded food resources for underworlder "people." MC then started raising these s*aves like a sustainable energy source. MC would make them farm and feed them high level food to raise the energy stones in their chest then would habitually harvest these stones for his own use. I get that these energy source would help level up his energy limit but he'd gotten energy stones elsewhere before. Why couldn't MC just traded for these stones (seeing how s*avery existed in the underworlder culture and were easily disposable) instead of trading for lives, not giving them freedom, and completely treating them like produce?

Not to mention that despite having a girl he loved, he still, in the tiniest corner in his mind, had lusted after his sister-in-law. I'm not quite sure if his older brother had married her before his unfortunate and untimely demise, but the girl had been raised as such in his family and had always been coined sister-in-law. That he would create undergarments for both his girlfriend/future fiancée and his sister-in-law was just icky in my mind.