I did not know this would continue the story-line of the other MV's, but it was a surprise because I just assumed it would be a typical KPOP-like song.
BUT, I'm glad it's different.
Also, I don't know if it's just self-nostalgia, but it reminded me of '90's American hip-hop/R&B girl groups like TLC or Destiny's Child-- but, more on the hip-hop side.
I'm sure there's a better description or official description out there on the Internet, but, this was my reaction.
I also love that we can hear more of their vocals.
So, for me at least, it was a strong debut.
And I've read something about what S2 did to Hot Issue after their debut so I hope the same internal problems do not occur for this group, too!