In 2006, Gook made her debut as a model for CF green tea. She appeared in the morning drama, You are Very Good (난 네게 반했어) in 2008. Gook later gained popularity for portraying Choi Jin-hee in Boys Over Flowers (2009). The same month, she signed a one-year exclusive modelling deal with Coreana Cosmetics. Later that year, Gook had a small role in the film, Castaway on the Moon. She made a cameo in The Woman Who Still Wants to Marry starring Boys Over Flowers costar Kim Bum in 2010. The same year, she had a supporting role in the morning drama, The Scarlet Letter. In 2014, Gook appeared in the film, Awaiting playing a therapist.
|2008||You are Very Good|
|2009||Boys Over Flowers||Choi Jin-hee|
|2010||The Woman Who Still Wants to Marry||Oh Se-na||Episode 15|
|The Scarlet Letter||Jin Jin-joo|
|2014||Bride of the Century||Model||Episode 16|
|2006||Heart Is...||Travel agent|
|2009||Castaway on the Moon||Fantasy girl|
|2010||The Brass Quintet|
- She has the same birthday as Boys Over Flowers costar Lee Si-young but Gook is two years younger.