Choi Jin-ri, better known by her stage name Sulli, was a South Korean singer and actress. She first made her debut as a child actress, appearing as a supporting cast member on the SBS historical drama Ballad of Seodong (2005). Following this, she earned a number of guest roles, appearing in the television series Love Needs a Miracle (2005) and Drama City (2007), and the film Vacation (2006). She then subsequently appeared in the independent films Punch Lady (2007) and BA:BO (2008), the former being her first time cast in a substantial dramatic role.

Ballad of Seodong is a South Korean television series starring Jo Hyun-jae, Lee Bo-young, and Ryu Jin. It aired on SBS from September 5, 2005 to March 21, 2006 on Mondays and Tuesdays at 21:55 for 55 episodes.