I believe someone might already write the similar thread with this one before.
I just come back from my kpop hiatus for months. I just accidentally heard 'Cupid' for the first time in a store and I like it very much. And when this song went viral and being everywhere, I thought when I come back to my kpop acc I will see Fifty Fifty everywhere. Surprisingly, it is not the case. I was there when Momoland, Mamamoo, Brave Girls and GFriend went viral in kpop scene. They all have members that rise in popularity and being the talk of the town. Yet, I don't see this happen to Fifty Fifty. My moots on twitter know their song but none of them knowing even one member from this group.
I don't understand, usually when the song went viral, it will giving a lot of impact to the group and its members' popularity. Kinda disappointed that people not really interested in them and scared if they unable to built their fanbase even after they achieved all of this.