In 2009 Hyomin became as a member of T-ara. The group made their debut on July 30 with their song "Lie". In 2009 and 2010, Hyomin was in the KBS' television show "Invincible Youth". In November 2009, Hyomin was in the musical "I Really Really Like You". Fellow T-ara member Jeon Bo-ram was in the same musical.