Fold, he has aces.
Everyone who says it won't happen, it happens all the time online. Openshoving 100+ bb with aces. It is more profitable then playing the hand for a small ammount, and get a big multiway pot since the blinds are low.
People call with kings, AK and Queens, sometimes even worse.
But... this is the wsop. Ofcourse there will be some amateurs, but i don't think its most profitable to play it that way at the wsop lol.
It would be very wrong to call the shove there with kings, the only hand people open shove 100+bb first level(s) is aces.