Ku/Goo Hye Sun is a South Korean actress, singer/songwriter and director who came to stardom with the drama Pure in Heart (2006) and is best known for her role as Geum Jan-di in the hit KBS drama Boys Over Flowers (2009). She also gained recognition from the critics and fans with the historical drama The King and I (2007) and Angel Eyes (2014), etc. Goo won several awards such as Best New Actress in KBS Drama Awards (2006), Best Asian Actress in the 6th Yahoo! Taiwan Asia Buzz Awards (2009) and so on.
Ku Hye-sun entered the entertainment industry after gaining popularity on the internet as an ulzzang. She began her acting career in one-act dramas and the sitcom Nonstop 5. Ku also attended Sungkyungkwan University.
Kuis still single.