The shocking truth behind the other members of 4Minute

Recently I saw the new Hyuna MV, 'Ice cream' and thought it was terrible, but that's beside the point. I already knew about Hyuna because she's "the-girl-without-eyebrows" in 'Gangnam Style' by Psy. Anyway I was intrigued by her lack of  eyebrows and decided to Wikipedia her and much to my surprise she's actually in a girl group called '4Minute'.

When I read that name I was vaguely reminded of a song called 'Volume Up' which made me go "Huh, I thought that was a 2NE1 song", before realizing that 'Huh' is also a 4Minute song. I know this is confusing but bare with me.