Question: What agency discovered an American singer based in South Korea who was on the first season of a South Korean reality show that aired every Friday on KBS 2TV from April 8 to December 2, 2016 ?
Sentence (from "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.
Relevant evidence: No