For what it's worth, all the members of Crayon Pop are over twenty, so they're young women posing as teenyboppers. The oldest, Gun Mi, was born in 1988, so she's already considered twenty-five under the Korean age system (where you're one year old at birth and, IIRC, turn a year older every New Year). And lead vocal Way went/goes to Seoul Art College, which sounds as if it ought to be pretty boho. :)

So, yeah, I'm thinking they might be boho hipsters playing at being idols with a detached, knowing version of cute, or at least perhaps their managers are playing at making idol pop with a detached, knowing version of cute.