Born in 1994, Jung Krystal Soo, also known as Jung Soo Jung and Krystal Jung, is a singer and actress. She is a member of South Korean quintet girl band F(x). Her older sister Jessica is a member of Girls' Generation, which is signed to the same company -- S.M. Entertainment. She has recorded many commercials for famous brands such as Adidas, Calvin Klein Jeans and Clean & Clean. Jung has also appeared in several music videos.