F(x) is not particularly famous now, and relatively speaking, I can't see any particularly famous songs. But if you have to say it, of course, it is the title song of each album. La cha ta, then chu~, then no ABO. In addition, Mr. Buji is also very famous. It's not easy for Mr Buji to get a relatively high ranking on the mnet list after that extended play has been published for so long.
I mean, it doesn't necessarily sound like a hit song.