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In 2006, S.M. Entertainment, an entertainment agency based in South Korea, recruited Luna after seeing her performing on a SBS's television program, "Truth Game". After training for more than three years, she became a member of a Kpop girl group, f(x) serving as the group's main vocalist and lead dancer. On September 1, 2009, f(x)'s first single "La Cha Ta" was digitally released. The group's first broadcast performance of "La Cha Ta" was held at MBC's music show Show! Music Core on September 5, 2009. Since then, f(x), has released three digital singles and a mini-album, Nu ABO, and have won numerous awards. The group participated in the SMTown Live '10 World Tour alongside their label-mates in Seoul, Shanghai and Los Angeles. f(x) has also appeared in their own reality shows like Hello f(x),f(x)'s Koala, Amazing f(x), and Go! f(x). They have also endorsed some commercial products like an LG Cyon cell phone, 'Lollipop', and clothing brands like K-Swiss. On November 24, 2010, Avex Entertainment, released a statement that f(x) was now signed to their agency for future releases in China, Japan and Taiwan.
Luna has recorded quite a few tracks for OSTs of various Korean dramas. In late 2009, Luna and Krystal contributed to the soundtrack of Invincible Lee Pyung 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 Master of Study. Krystal and Luna again recorded a duet song for Cinderella's Sister soundtrack, called "Calling Out". In late 2010, Luna released a single titled "Beautiful Day", as part of the soundtrack for Please Marry Me. On December 23, 2010, a duet collaboration between Luna and Super Junior's Yesung was released, titled "And I Love You" for the soundtrack of President.
^ abIn the episode of vitamin air on 2012-10-3, Luna reveal her Korean ID card, from the last Han letter we can predict from the number of stroke, its 英 and not 怜. 2012-10-03.|accessdate= requires |url= (help)