Kang Ji-young was born on January 18, 1994, in Paju, South Korea. She debuted at the age of 15 as a third grade middle school student. She is one of the 2 members that joined after member Kim Sung Hee left. She sang Girls' Generation's song "Kissing You" for her audition. Kang is the cousin of the Korean pop singer NS Yoon-G.
She attended Bongilcheon Middle School,Muhak Women's High School. She eventually graduated in February 2012 and currently attends Sungkyunkwan University's Department of Acting Arts.
The group debuted on March 29, 2007. In 2008, Jiyoung joined the group after member Kim Sunghee decided to leave. At the time of her admission, she was only 14 years old making her the youngest member of the group which was previously Nicole Jung. The group eventually made their return with Rock U. Their comeback saw a change in the group's original "sexy and mature" image to a "cute and playful" appeal.
On December 4, 2008, the group started their comeback on M! Countdown with "Pretty Girl". In February 2009, the group released their second mini-album "Honey". "Honey" became the group's first #1 single when it topped the M! Countdown and The Music Trend.
In late July 2009, Kara revealed their second album named "Revolution". Due to the popularity of their songs Wanna and Mister, Kara's overall popularity increased. In February 2010, Kara started promotions with their third mini-album "Lupin". In August 2010, Kara officially debut in Japan with "Mister". After their successful debut in Japan, Kara released their fourth mini-album Jumping in November 2010.
In 2011, the group was ranked at #1 on the Recochoku favorite Korean artists in Japan poll. More recently, JiYoung was the only Korean female singer to be featured on CDTV Japan's Favorite Female Artist Ranking for 2011, where she was ranked at #21.