text: 2005–2012: Transitioning to acting Chakra disbanded in 2004, and Jung pursued acting full-time. After undergoing 11 unsuccessful auditions that year, she said she began doubting her decision to become an actress. In 2005, she gained recognition in the cult vampire sitcom Hello Franceska, then made her breakthrough in the romantic comedy My Name Is Kim Sam-soon. The series was a massive success with average ratings of over 37%, and 50.5% for the finale. Jung was praised for her portrayal of a fragile but good-natured character who fights for the hero's love, and eventually became one of the few successful singer-turned-actresses in the country.
  Her follow-up series Autumn Shower received low ratings, but she rebounded with Which Star Are You From?, in which she played a country bumpkin living in the mountains of Gangwon Province. She was cast in her first movie leading role as a girl with multiple personality disorder in 2007's Two Faces of My Girlfriend, and though it was not a box office hit, she won Best New Actress at the Blue Dragon Film Awards.
  As the titular character in 2009's Princess Jamyung, Jung starred in her first period drama. She then played a hikikomori in Castaway on the Moon, arguably her most notable film yet.
  Both her 2011 big screen projects had elements of romance. She played a teacher in a small South Korean village who meets a North Korean officer in the Korean War comedy/drama In Love and War, and in Kwak Kyung-taek's melodrama Pained, she played a hemophiliac who falls for her opposite, a man with analgesia, the inability to sense physical pain.