I don't get it. Are the two short hair girls together??????

No, just friends with benefits

But I don't think fwb can act crazy like that when she wants to hang out with someone. The other girl is in a one sided relationship in her head.

i think it will be explained more in later chapters, but yeah, Hwayeon is crazy for Jeoungwon even though they're not exclusive. I still dont really understand much from the raws aside from the google translate, but i know at least that much, haha.