Heo Ga yoon

Heo Gayoon is a South Korean idol singer. She is a member and main vocalist of South Korean girl group 4Minute and its subunit group, 2Yoon, along with Jiyoon, the latter formed by Cube Entertainment in 2013.

Gayoon was born on May 18, 1990 in Seoul, South Korea. Gayoon received second place at SM 9th Best Singer Contest in 2005. She graduated from Dongduk Girls High School and is currently attending Dongguk University, Theater Major. On September 17, 2014 Gayoon together with other stars have been appointed the ambassadors of Dongguk University.

Source: Wikipedia