F(x) is composed of five members in South Korea which is a girl group formed by SM Entertainmentin 2009. 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 made their debut on September 1, 2009 with release of a digital single "LA CHA TA" . The quintet consists of Victoria, Amber ,Luna ,Sulli and Krystal
In late 2009, Luna and Krystal contributed to the soundtrack of television series Invincible Lee Pyon Kang with a duet, "Hard but Easy". In early 2010, Krystal, Luna and Amber also recorded the song "Spread Its Wings" for the soundtrack of the KBS's drama, God of Study. Krystal and Luna recorded a duet song for the KBS's drama Cinderella's sister original soundtrack, called "Calling Out". In late 2010, Luna released a single "Beautiful Day", as part of the official soundtrack of the KBS drama 'Please Marry Me'. On December 23, 2010, a duet collaboration between Luna and SJ's Yesung was released, titled “And I Love You“, for the second original soundtrack of KBS'sPresident.
Krystal appeared on a daily Korean sitcom called "perfect charmness everytime I see you" whcih started from March 22, 2010 to November 2, 2010. The sitcom has total of 138 episodes but Krystal appeared from the 60th episode.
On April 2, 2010, Y-Star started airing first variety show of the group, Hello f(x). The program consisted of four episodes which showed close coverage on their preparations for the first mini-album,Nu ABO. On October 2, 2010, their second reality show, Koala, started airing on MBC'S Every1. The show featured the group's background life during the SMTown Live 10' World Tour.
In late 2010, members Victoria, Sulli and Krystal became model endorsers for the clothing brand, Calvins Klein X Jeans. A music video for the song, "Beautiful Day", was released in December 2010 to endorse the brand. The group also endorsed another clothing brand,K-Swiss, for their 2010 winter collection.
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