 But after it didn't work out she then signed under YG Entertainment.Originally set to debut as a singer (supposedly in a three-member girl group with 2NE1's Park Bom and Sandara Park), YG Entertainment CEO Yang Hyun-suk advised Ku to pursue acting rather than music.She made her debut in a CF for Sambo computers and then made her television debut in the KBS horror series "Anagram", and continued to appear in one-act dramas.