Chou Tzu-yu (born June 14, 1999), professionally known by the mononym Tzuyu, is a Taiwanese singer based in South Korea and a member of the K-pop girl group Twice, under JYP Entertainment. In 2012, Tzuyu was discovered by talent scouts at the MUSE Performing Arts Workshop in Tainan; she later moved to South Korea in November 2012 to begin training. According to Gallup Korea's annual music survey, Tzuyu was the 3rd most popular idol among South Koreans in 2016. She ranked 9th in the 2017 survey and 12th in 2018. In 2019, Tzuyu was ranked as the 2nd most popular female K-pop idol in a survey of soldiers completing mandatory military service in South Korea.