 She gained widespread recognition in the television dramas "Pure in Heart" (2006), "The King And I" (2007), "Boys Over Flowers" (2009), "Take Care of Us, Captain" (2012), "Angel Eyes" (2014) and "Blood" (2015).Ku Hye-sun entered the entertainment industry after gaining popularity on the Internet as an ulzzang.She used to be a trainee under SM Entertainment, before switching over to DSP Media and preparing to debut in a girl group called Ria.