* TheDanza
** Krystal in the drama ''"More Charming by the Day"''. Her character's name: ''Jung Soojung''. [[note]]Born as Krystal Jung, Jung Soojung is her Korean Name. Soojung also happens to mean "Crystal".[[/note]]
** On the other hand, Krystal's character in the sitcom ''"High Kick: Revenge of the Short Legged"'' is named Ahn Soojung.
* FanCommunityNickname:
** The fans are usually given the misnomer "Aff(x)tion" - it's the name of the fan forum, not the fanclub.
** Some of the fans have also started calling themselves ''nameless'' or ''f(nameless)''.
** An official nickname was finally announced in 2017 - [=MeU=].
* [[PromotedFanboy Promoted Fangirl]]: Amber went from an SM fan to a member of SM herself.
* WhatCouldHaveBeen: Following the steps of Music/GirlsGeneration and Music/DongBangShinKi, f(x) was supposed to debut and promote in Japan, but plans for that were scrapped due to the Dokdo islands dispute (a major factor in Japan's declining interest in Korean media in 2012). Aside from releasing "Hot Summer" in 2012 as their Japanese debut single and performing several concerts there, a Japanese version of "Pinnochio" was recorded and filmed but never had an official release (though it was leaked around 2016).
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