Why are you not 4-betting this pre? All in is only 6 times the 3-bet so you need to shove this. With so many players in the pot you have to try to get it heads-up before the flop. As played I don't know what to do because I never put myself in this spot. Without any experience in this situation I would say fold. This is a very ugly flop for KK with 4-way action.