Music: f(x)

f(x) in 2010. (L-R) Victoria, Amber, Krystal, Sulli, Luna

f(x) is a South Korean Pop Music Girl Group formed in 2009 by SM Entertainment. The name is a play on the mathematical notation for function, with "f" signifying "flower" and "x" representing the female's double X chromosome. The group members have also been nicknamed "function girls".

The quartet consists of Victoria, Amber, Luna, and youngest Krystal, who is coincidentally the younger sister of former Girls' Generation's Jessica. Member Sulli was also a member at debut but went on a hiatus from mid-2014 due to the stress of dealing with malicious internet comments about her, and eventually she officially withdrew from the group in August 2015 with her wish to focus on her acting career being the official reason.

The group debuted on September 5, 2009 with the release of the single LA ch TA. The lead single off their album Pinocchio gained their first music program win and was their first song to win the triple crown.

f(x) became the first South Korean group to perform at SXSW and they also did a video with actress Anna Kendrick for Funny Or Die.com, both events of which has more or less garnered attention to f(x) in the US.

Korean Discography:
  • LA chA TA single (2009)
  • Chu~ single (2009)
  • Nu ABO EP (2010)
  • Pinocchio (2011)
  • Hot Summer (Pinocchio repackage, 2011)
  • Electric Shock EP (2012)
  • Pink Tape (2013)
  • Red Light (2014)

Japanese Discography:
  • Hot Summer single (2012)
  • SUMMER SPECIAL Pinocchio/Hot Summer (2015)

Tropes related to f(x):

  • Animal Motifs
    • Amber once said in an interview that she's a Koala, Victoriaís a hamster, Krystalís a tadpole, Sulliís a penguin, and Lunaís a puppy.
    • Fans have also jokingly said that Amber resembles a llama and she's accepted it, to the point where she's adopted "llama" as her new nickname.
  • Ascended Meme - The fans calling Amber "llama". It's now part of her twitter username (llama_ajol).
  • Bifauxnen - Amber who is a tomboy and dresses like such, which matches her pretty and androgynous looks.
  • But Not Too Foreign - Krystal and her sister Jessica were born and raised in America, therefore making them Korean-American. Same for Amber, who was born and raised in America to Taiwanese parents, making her Taiwanese-American.
  • Cooking Duel - There was one in the 12th episode of Koala, in which Luna and Sulli (who made a rice cake soup) teamed up to go against the team of Victoria and Krystal (who made kimchi pancakes). The duel was peaceful, though.
  • Cool Big Sis - Amber's sister Jackie and Krystal's sister Jessica act as chill and admired sibling mentors to them.
  • Cosmetic Award - The reward in their last mission in Koala? A piece of cardboard with the words "End of broadcast. You have done well".
  • The Cutie - Sulli was f(x)'s resident fake maknae mostly because she looks (and acts) younger than the real youngest Krystal.
  • Darker and Edgier: Their album and title track "Red Light" has a darker concept compared to previous albums.
  • Denied Food as Punishment - The consequence in the 7th episode of Koala, in which the first person to find the Egg Pie shop gets to buy... well, an egg pie. (In the other episodes, they sometimes compete against each other to get the prize money which would be used to buy food).
  • Fake Memories - For 24 years, Victoria thought she was O blood type and only found out after that that her real blood type is A.
  • Family Business - Krystal's older sister Jessica is also in SM and is a former member of the girl group SNSD.
  • Fangirl
    • Amber is a big fan of Linkin Park's Mike Shinoda, and when she was a kid, she tried copying his voice.
    • Episode 3 of Jessica & Krystal shows that Krystal's a huge fan of Pharrell Williams, Frank Sinatra and even her sister and SNSD.
  • Food Songs Are Funny - Ice Cream at one point repeats the line "Milkshake, milkshake, actually Iím Ice cream, ice cream, vanilla ice cream".
  • Friend to All Children - Luna gets along well with kids.
  • Fun with Palindromes - Krystal's Korean name.
    "From the front, it's Jung Soo Jung. Say it backwards and it's Jung Soo Jung. My name is Jung Soo Jung!"
  • Genki Girl - Luna. She's the "energy pill" of the group.
  • Girl Group - A Korean Pop Music example of a girl group.
  • Multiethnic Name - Chrystal Soo "Krystal" Jung and Amber Josephine Liu.
  • Multinational Team - Let's have a recap: Victoria is Chinese, Amber is a Taiwanese American, Luna and Sulli are Korean, and Krystal is a Korean American.
  • Not So Stoic - Ice Princess Krystal. It runs in the family. Watch f(x)'s shows and you'll find out that she and her members are actually very nice and energetic. Also see the Kuudere entry.
  • Older Than They Look - Sulli has quite the babyface, even though she's actually about 7 months older than the youngest member Krystal.
  • Peek-a-Bangs - Amber has her long bangs sometimes covering her eyes in the LA chA TA music video.
  • Retraux - The style of the "art film" for their 2nd full-length album Pink Tape was quite vintage and hipster-like.
  • Put on a Bus:
    • Amber was once absent from activities due to her ankle injury, and it went on for more than 6 months. The long absence lead fans to speculate that Amber had a dispute of sorts with SM (there were allegations she fought with another member and debated leaving, but this was never proven), thus lead people to think that f(x) would have their comeback with only four members. Fortunately that wasn't the case.
    • Following massive flack she was receiving for all kinds of reasons, Sulli's hiatus from mid-2014 began in this manner with SM saying the hiatus was indefinite and she'll not leave the group. This was averted in the end when she never returned from said hiatus and instead withdrew from the group in 2015.
  • The Reveal - Krystal revealing Amber's middle name in Hello f(x) as a surprise for many, including Amber who had no intention of revealing it. She's become okay with it since then.
  • She's Got Legs: All have pretty legs and mostly aren't afraid to show them off. Even Amber doesn't mind showing them off now and then
  • Shrinking Violet - Krystal. On the first episode of Jessica & Krystal, Jessica even revealed that when Krystal was young she would cry when people even looked at her.
  • Silly Love Songs - Chu~ is a ridiculously cute song about kissing, complete with lyrics like "Do it do it, chu~♥ It's true, true, true, true itís you".
  • Stage Names - "Victoria" for Song Qian, "Luna" for Park Seonyoung, "Sulli" for Choi Jinri. Krystal technically counts since her birth name is actually spelt Chrystal.
  • Surprisingly Good English - they have two fluent speakers despite being a Korean group:
    • Krystal, who was born in California. They moved to Seoul in 2000 after her sister Jessica was scouted by SM. (Krystal was too young to be scouted at that time. She was scouted in 2006).
    • Amber, who also grew up in America and moved after she was scouted.
  • Surprisingly Good Foreign Language - People who aren't avid fans might think that all the members of f(x) are Korean. That's not true:
    • Victoria grew up in Beijing and is fluent in Mandarin Chinese.
    • Amber's parents are Taiwanese and so she has conversational fluency in said language. She is a Cantonese speaker as well.
  • Surreal Music Video
    • Not an official music video, but the teaser / "art video" for Pink Tape. Try to decipher what the heck's happening in the video.
    • The teaser and music video for Red Light is full of confusing symbolism and artsy scenes.
  • Take That - To the too-high standards of the South Korean celebrity industry. Blink and you'll miss it, but here it is, from the ending credits of Koala episode 11.
    Sulli: South Korea is so picky about being skinny, that's why you can't develop/grow anymore!
    Luna: We need to have some fat!
    Sulli: Don't you agree? Everyone's so skinny!
    Victoria: We should stop here... (laughs) Please edit this out!
  • Team Mom - Victoria, who cooks and does the grocery shopping for the members. She's endearingly called "Vic Umma" (mother). During her time in the show We Got Married, the other members even treated her partner Nichkhun (of 2PM) as their dad.
  • Teen Idol - Just about everyone were in their teens when they debuted as idols.
  • Tomboy - Amber, and their stylists really like to emphasise this. She prefers to dress more boyishly such as baggy shorts and loose clothing, has Boyish Short Hair, and used to play a lot of sport when younger (which is how she adopted her tomboy looks in the first place). It's to the point that when she once grew her hair out it was interpreted as a Girliness Upgrade.
  • Travelogue Show.
    • In Hello f(x), they went to Africa for a photoshoot, to Thailand to perform in the Pattaya Music Festival, and to Japan (along with label-mates SHINee) for the Boys Before Flowers promotion.
    • There's Koala, in which they went to 5 countries to promote Korea's culture - although it sometimes looked more like a cooking (and eating) show than a travelogue show...
    • Amazing f(x) had the girls travelling to New Zealand.
  • Unperson - This was done to Amber when she was recovering from her ankle injury, which went for over 6 months. When f(x) was filming Koala, because she wasn't part of it, video footages of the members talking about Amber were edited out and it went as far as asking a Hong Kong fanboy that they were filming to take down his poster of Amber.
  • Who Wears Short Shorts?: Victoria, Krystal and Luna mostly alternate on who wears them (it's most common Krystal and Luna, when Victoria wears hotpants, the other two get the tight pants). Sulli often sticks with skirts and Amber only wears pants and long shorts.
  • You Gotta Have Blue Hair
    • Luna had blue hair in the Pinocchio music video and again for Red Light.
    • Krystal had pink hair and Sulli went red for "Rum Pum Pum Pum".
    • Amber went red for Red Light.
  • Younger Than They Look - Krystal. She was only 14 years old in the LA chA TA music video, which was released in September 2009, but looked like a girl in her late teens. Contrast to Sulli, who is 7 months older yet on the other hand has quite the babyface.
  • Zettai Ryouiki: Luna, Krystal, and Sulli had knee-high socks in "Rum Pum Pum Pum", while Amber had three-quarter socks.

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