They went from massive success with Me Gustas Tu and Rough to massively underperforming with Fingertip, snatching a decent hit with TFTMN, but they haven't snatched a hit or seen any success since. From 2017-now, many other girl groups such as Red Velvet, BP, Mamamoo, etc have managed to see more success.
This lack of success would inevitably lead to their disbandment, but what went wrong? How did they get from the highs of MGT/Rough to the lows of every comeback after TFTMN and eventual disbandment?