Idk, but from all the 4th generation group, le sserafim stands out the most. they give me so many cheerful, happy vibes. watching them is so refreshing
I think it just means they are fans at the working age where they are capable to finance their own expenses? By the way, based on a survey, the fans who attended the fanmeet are actually mostly in their 10's, 20's & 30's and the gender ratio revealed that over more than 50% are actually females surpassing the male attendees tho only with, iirc, around 1-5% difference.