Kang Ji-hyun, known professionally as Soyou, is a South Korean singer. She is best known as a former member of the South Korean girl group Sistar.

Sistar was a South Korean girl group formed in 2010 by Starship Entertainment. The group consisted of Hyolyn, Bora, Soyou and Dasom. They made their official debut with the song "Push Push" on 3 June 2010. Their debut studio album So Cool was released on 9 August 2011. Their second album, Give It to Me, was released on 11 June 2013. Their biggest hits include "So Cool", "Alone", "Touch My Body", "Loving U" and "Give It to Me". Their fourth single, "So Cool," debuted at number one on the Gaon Digital Chart as well as the Billboard Korea K-Pop Hot 100 singles chart, starting a streak of 9 consecutive number-one hits before the group's disbandment in 2017.