During a recent SNS live, Luna was asked if f(x) were disbanded. Luna answered firmly, "We haven't disbanded. We really won't disband. f(x) is still 'ing'."
f(x) debuted in 2009, with their final group activity being back in 2015 through "4 Walls". While the girls are still active as solo artists, they've have not really had much in group activities.
Luna said, "I'm sorry we keep making you wait and cry. I'm sorry we keep coming out as solo artists. But we'll work hard so we can come out more actively as solo artists, and again with the rest of the members. Sorry."
Don't apologize, Luna!