 Ku rose to fame for her role as Geum Jan-di in the mega hit KBS2 drama "Boys Over Flowers" opposite Lee Min Ho, which gained her pan-Asia popularity.After a year in limbo with no broadcasting slot, her first pre-produced drama "The Musical" finally aired in September 2011.Ku next starred as a female pilot in the SBS series "Take Care of Us, Captain", followed by "Absolute Darling", the Taiwanese drama adaptation of the manga "Absolute Boyfriend".