Initially, MC was supposed to be in a tutorial for new people, but it quickly turns out that grossly overpowered people somehow made it in because they somehow know the tutorial exists, and get groomed for it by their families, so they sealclub the bejeezus out of everything. The tutorial is ALWAYS, the same, too, so everyone else has all these cool plans and know about a whole bunch of secrets, then everyone just sort of power-games the tutorial. Oh and it turns out the tutorial isn't even locked to newbies, either. Therefore any idiot can go back into to smash some newbs, because ???? Another massive plot hole right there.
Not that it's really a problem since the MC rapidly becomes vastly more powerful than people who have spent their whole life preparing for the tutorial.
lol @ hard working protagonist tag, if you read this you know what I mean :D