f(x) met with reporters at a waiting room during a music show to share their feelings about their recent very successful comeback with the song “4 Walls,” a Deep House EDM song.

They said, “We all loved the song, but we were worried that its genre is different from our usual style. Thankfully, people seem to like it, so we are very grateful and happy.” Despite their worries, the ethereal qualities of “4 Walls” suits the character of f(x) very well.

Of their recent comeback, they said, “It has been such a long time, so we’re glad to be spending more time with each other. Practicing for our comeback reminded us of our pre-debut times, and we enjoyed it very much.”

They will soon hold a solo concert in Seoul Olympic Stadium, between January 30-31. They said, “This is the first time we are having our own stage. We are very excited and nervous, as this is the first stage that we’re meeting our fans exclusively, and we have a lot of performances that we have yet to show you.”

Source (1)