Last summer, f(x) hit a wall when original member Sulli took a hiatus from the act leaving many speculating discord inside the underrated-yet-extremely-consistent quintet. She officially left the group in August this year just as f(x) was announced to be preparing for their comeback as a foursome.
The girl group's labelmates Girls' Generation and EXO all lost members this past year too but with nine and 10 members, respectively, their losses, while still certainly important, could arguably be patched up more easily than a team with half those numbers.
But shrewd damage control is the crowning achievement of f(x)'s new album, 4 Walls. Throughout the 10-track set, the ladies step up more than ever: for example, Amber's raps are way tighter, Luna's vocals feel extra powerful and Krystal's unique timbre blends with the others for their undeviating signature color.