f(x) was just formed to promote Luna. Everybody else in the group are pawns.
Amber and Krystal get thrown into the basement, Victoria elopes with Nickhun, Sulli persues her acting career, and that is how Luna will end up going solo.
Krystal faints and everybody's scared SM will throw her into the basement with Amber, Kibum, and Tiffany.
That should probably say something about SME’s management trololol