Premise: Tiffany Hwang . After four years of training , Tiffany debuted as a member of girl group Girls ' Generation ( and later its subgroup TTS ) in August 2007 , who went on to be one of the best-selling artists in South Korea and one of South Korea 's most popular girl groups worldwide .
Hypothesis: Tiffany Hwang was a member of a K-pop group.
Label: ENTAILMENT