Tiffany Hwang was in Girls' Generation.
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 . In 2016 , following her contribution to several side projects during the early part of her career , Tiffany became the second Girls ' Generation member to release a solo debut album , I Just Wan na Dance .