[4] She auditioned for DSP Media by sending a video of her singing an Ivy and Black Eyed Peas song.

Jung made the decision to go to South Korea and experienced hardships such as adjusting to the culture and missing her friends.

[5] She accepted DSP's offer, her mom moved with her to South Korea and has opened up a Korean BBQ restaurant called "Aura The Grill".

[6] Jung was on a show called "KAIST" which was renamed to "Nicole The Entertainer's Introduction to Veterinary Science" in Konkuk University.

[8] Jung debuted as the youngest member in Kara on March 29, 2007, with their single "Break It", alongside Park Gyuri, Han Seungyeon, and Kim Sunghee.

On December 4, 2008, Kara released their 2nd mini-album "Pretty Girl", and in February 2009 came the follow-up album "Honey"; the latter's title track of the same name became the group's first #1 single on music shows when it topped M!

On January 19, 2011, Jung announced, alongside fellow members Kang Jiyoung and Han Seung-yeon, that they were terminating their contract with DSP through court.

[citation needed] Jung injured her ankle during Kara's first stand-alone concert in Korea, which was held on February 18, 2012.

[15] On January 13, 2014, it was announced that Jung would be withdrawing from the group due to the expiration of her contract with DSP Media,[16] and that she would be flying to the States for two months to focus on improving her vocal and dance skills while preparing to make a solo debut.

Nicole's new agency was established by CEO Gil Jong Hwa, who had been with KARA from their debut to their peak.

[26] Jung was featured on former DSP Media artist Sunha's first album Fahrenheit in the song "String" (2008).

[citation needed] In April 2009, she sang a duet with former Noel member Kang Kyun-seong called "Happy And".

[27] In August 2009, she and singer Jay Park became part of historical culture variety show Nodaji, replacing Choi Min-yong and Kim Tae-hyun.

[citation needed] In September 2009, Jung was featured in numerous live performances of Mighty Mouth's single "Love Class".