yes and no. Yes there are others like him to an extent.
They are not humans and are from different dimensions/worlds. This gets into the real plot pretty heavily so to keep it short, there are a few others with abilities far surpassing MC's current power level. MC's potential is far greater though once fully unlocked. None of those guys are on earth (those 2 guys who went to the island last chapter are 2 of them)
No, he is more or less curently one of the strongest on earth. There are a few currently who may be stronger, but not by that much.
@vopper13 you'd better not read the novel.
some of the people who read it said it became boring after jeju arc.
Thus i am refraining from reading it too
so what will happen to this shellner someone, did she receive backlash trying to upgrade his crazy power or it's just 'it doesn't work, so~~rry' moment?
wud be fun seeing a person explodes to pieces trying to poke a million volt power plant.