That title, 'The World's Fastest Level Up', got me curious too, and honestly, the premise itself sets up the main hurdle right away. The entire world gets a System, but this guy's level skyrockets compared to everyone else. His biggest challenge isn't some monster, it's society. Think about it. The System just dropped, people are figuring out the rules, and then this random dude is already clearing high-tier dungeons. Governments, corporations, other players—they'd all see him as an asset to control or a threat to eliminate. His speed isolates him.
There's also the personal side, which I found more interesting. How do you maintain relationships when you're literally experiencing reality on a different timescale? His friends are still struggling with goblins while he's fighting dragons. The loneliness and the pressure of being a statistical anomaly would warp anyone. The story really wrestles with whether 'fastest' actually means 'best,' or if it just breaks the game in a way that makes it unplayable. I kept waiting for the other shoe to drop, like a system patch or a hidden cost to his ability.