Hyun Jyu-ni debuted as the frontman of the four-member girl rock band BellaMafia, which released the album Overstep in 2008. TV director Lee Jae-gyu spotted her in the musical Bandits and cast her as a flutist in his television series Beethoven Virus. Hyun had played the flute from a young age, and was previously a member of the Seoul Youth Chamber Orchestra. Since then she has transitioned to an acting career, appearing in supporting roles as a pregnant young girl from Yanbian in Take Off, a hacker in IRIS, a firefighter in Love 911, as well as a starring role as a rock-band vocalist in Sky and Ocean. Her most high-profile role yet was as a young single mother who joins the Comeback Madonna Band in I Am Legend.