Born Tiffany Hwang, she is a South Korean-American singer known best as a member of the Girls' Generation all-female music group. Also a musical theater performer, she appeared in a 2012 production of Fame! In 2016, she began starring in Sister's Slam Dunk.
She was discovered after performing in Los Angeles, and she auditioned for SM Entertainment when she was just fifteen years old.
She hosted a number of television programs, including Show! Music Core for the Munhwa Broadcasting Corporation.
Born Stephanie Young Hwang in San Francisco, California, she later moved to South Korea to start her music career. She has two older siblings. She was in a relationship with musician Nichkhun until they broke up in 2015.