常見問題：
問：1. Q: What is Secret? 答： A: Secret is a South Korean girl group formed by TS Entertainment in 2009.
問：6. Q: What is Secret's most popular song? 答： A: Secret's most popular song is "Poison," which was released in 2014 and became a huge hit in South Korea.
問：Q4: What was the first hit song of the Korean boy band "GOD"? 答：A4: The first hit song of the Korean boy band "GOD" was "To My Mother" released in 1999, which became an instant sensation.