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：8. Q: Has Secret appeared on any variety shows? 答： A: Yes, Secret has appeared on various South Korean variety shows, such as "Invincible Youth," "Law of the Jungle," and "Hello Baby."
問：冰桶挑戰在全球範圍內的影響如何？ 答：冰桶挑戰在全球範圍內引起了廣泛的關注和參與，成為了一個國際性的慈善活動。