History YMMV / FX

* CultClassic: Their discography has been seen this way since they started their indefinite hiatus in 2016 and [[PosthumousPopularityPotential especially after Sulli's suicide in 2019]]. While they were popular enough during their run to have ''all'' of their full albums be number ones in Korea, they didn't ''quite'' have the same level of mainstream recognition as more conventional girl groups like Music/GirlsGeneration. Their only headlining tour took place ''after'' Sulli left and only in Korea and Japan. Though their videos don't get a lot of views, their fanbase is still active and their discography is seen as being ahead of its time in light of similarly electronic-focused groups like Music/{{Aespa}} debuting amid their hiatus. It also helps that the members have expressed interest in reuniting.

* CultClassic: Their discography has been seen this way since they started their indefinite hiatus in 2016 and [[PosthumousPopularityPotential especially after Sulli's suicide in 2019]]. While the were popular enough during their run to have ''all'' of their full albums be number ones in Korea, they didn't ''quite'' have the same level of mainstream recognition as more conventional girl groups like Music/GirlsGeneration. Their only headlining tour took place ''after'' Sulli left and only in Korea and Japan. Though their videos don't get a lot of views, their fanbase is still active and their discography is seen as being ahead of its time in light of similarly electronic-focused groups like Music/{{Aespa}} debuting amid their hiatus. It also helps that the members have expressed interest in reuniting.

* PosthumousPopularityPotential: Sulli was the co-face and co-visual (with Krystal) when she was alive, having been praised as having the archetypical maknae persona (despite being technically the second youngest, after Krystal), but she also had a very vocal hatedom that only became even more vicious as she tried to take on a more adult image. The hate toward her was so strong that she took a hiatus in 2014 that turned into a permanent departure the following year. Following her suicide in 2019, she has been hailed as one of the group's strengths and recognized as a tragic victim of cyberbullying. Tellingly, Sulli was the ''only'' f(x) member to make the [[https://www.allkpop.com/upload/2021/06/content/281204/1624896264-image.png list]] of the 100 most-searched idols in the first half of 2021.

* WhatDoYouMeanItWasntMadeOnDrugs: Their [[https://www.youtube.com/watch?v=r4u3BzM0rqo "art film"]] for ''Pink Tape'' which can either be a very artsy video... or NightmareFuel (especially the beginning part).

* FaceOfTheBand: Krystal and Sulli, the latter [[PosthumousPopularityPotential even more so posthumously]] whereas the former has become known more for acting due to the group having been mostly inactive since 2016.

* PosthumousPopularityPotential: Sulli was the co-face and co-visual (with Krystal) when she was alive, being praised as having the archetypical maknae persona (despite being technically the second youngest, after Krystal), but she also had a very vocal hatedom that only became even more vicious as she tried to take on a more adult image. The hate toward her was so strong that she took a hiatus in 2014 that turned into a permanent departure the following year. Following her suicide in 2019, she has been hailed as one of the group's strengths and recognized as a tragic victim of cyberbullying. Tellingly, Sulli was the ''only'' f(x) member to make the [[https://www.allkpop.com/upload/2021/06/content/281204/1624896264-image.png list]] of the 100 most-searched idols in the first half of 2021.

* PosthumousPopularityPotential: Sulli was the co-face and co-visual (with Krystal) when she was alive, but she was also constantly criticized for pretty much everything she did, often for ContractualPurity reasons, like dating a man ten years her senior. The negativity toward her was so harsh that she took a hiatus in 2014 that turned into a permanent departure the following year. Following her suicide in 2019, she has naturally been hailed as one of the group’s strengths and recognized as a tragic victim of cyberbullying. Tellingly, Sulli was the ''only'' f(x) member to make the [[https://www.allkpop.com/upload/2021/06/content/281204/1624896264-image.png list]] of the 100 most-searched idols in the first half of 2021.

* SignatureSong: "Airplane", which is impressive because it's a B-side. “Electric Shock” may also count due to its appearance in the [[https://www.youtube.com/watch?v=7VVERnrVTW8 short]] they did with Creator/AnnaKendrick for Creator/FunnyOrDie.

* AcclaimedFlop: While Luna's solo debut EP Free Somebody (and the title track of the same name) is widely considered a flop, it is heavily praised by those who have listened to it.

* PosthumousPopularityPotential: Sulli was the co-face and co-visual (with Krystal) when she was alive, but she was also constantly criticized for pretty much everything she did, often for ContractualPurity reasons, like dating a man ten years her senior. The negativity toward her was so harsh that she took a hiatus in 2014 that turned into a permanent departure the following year. Following her suicide in 2019, she has naturally been hailed as one of the group’s strengths and recognized as a tragic victim of cyberbullying. Tellingly, Sulli was the ''only'' f(x) member to make the [[https://www.allkpop.com/upload/2021/06/content/281204/1624896264-image.png list]] of the 100 most-searched idols in the first half of 2021.

* SignatureSong: "Airplane", which is impressive because it's a B-side. “Electric Shock” may also count due to its appearance in the skit they did with Creator/AnnaKendrick for Creator/FunnyOrDie.

* FaceOfTheBand: Krystal and Sulli, the latter [[PosthumousPopularityPotential even more so posthumously]] whereas the former has become known more due to the group having been mostly inactive since 2016.

* SignatureSong: "Airplane", which is impressive because it's a B-side.
* TheWoobie: Sulli - debuted at a young age, then the recipient of a non-stop barrage of hatred from netizens (including the [[https://www.asianjunkie.com/2015/02/18/sullis-biggestonly-fansite-closed-down-which-is-awesome-cause-the-admin-is-crazy/ infamous]] [[https://www.asianjunkie.com/2015/06/28/sullis-own-annie-wilkes-jinnabit-has-been-ranting-about-her-again/ sasaeng]] [[https://www.asianjunkie.com/2016/03/18/jinnabit-former-sulli-fansite-admincurrent-sulli-anti-is-now-going-after-amber/ Jinnabit]]) for anything and everything she did (see ContractualPurity above), leading to her departure from the group and ultimately her suicide.

* ContractualPurity: Sulli received a lot of backlash for dating Choiza from the rap group Dynamic Duo, [[MayDecemberRomance who is a decade her senior]], most comments treading into SlutShaming territory. It's partially due to these comments that pushed her to leave f(x). Furthermore, since she was given a cute, babyish image since debut and was NotAllowedToGrowUp in the fans' eyes, many saw her romance with an older man as shocking (especially after [[https://www.koreaboo.com/article/choiza-under-fire-for-his-past-lyrics-in-midst-of-sullis-instagram-post/ he released a highly erotic song that many perceived to be him bragging about his relationship with her]]). After leaving the group, her sexually charged social media posts and collaborating with Rotta (a controversial photographer known for his "lolita" concepts) did little to salvage what was left of her former fanbase.

* BrokenBase: [=MeUs=] don't seem to always agree on who is the visual of f(x). An example of a discussion can go as one person stating that Krystal is the visual only for someone else to 'correct' that person stating that Sulli is the visual. Eventually another person will show up and say Victoria is the visual. Needless to say, there are many [=MeUs=] who think f(x) has a visual wall and some might even say the whole group consists of visuals.

* BrokenBase: MeUs don't seem to always agree on who is the visual of f(x). An example of a discussion can go as one person stating that Krystal is the visual only for someone else to 'correct' that person stating that Sulli is the visual. Eventually another person will show up and say Victoria is the visual. Needless to say, there are many MeUs who think f(x) has a visual wall and some might even say the whole group consists of visuals.