常見問題：
問：4. Q: What was Secret's debut song? 答： A: Secret's debut song was "I Want You Back," released 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：全孝盛有發行過個人作品嗎？ 答：全孝盛於2016年發行了個人單曲《So Good》，並參與了歌曲的製作。