常見問題：
問：2. Q: How many members are there in Secret? 答： A: Secret originally had five members, but now consists of only four members after Song Ji-eun's departure.
問：4. Q: What was Secret's debut song? 答： A: Secret's debut song was "I Want You Back," released in 2009.
問：冰桶挑戰是什麼？ 答：冰桶挑戰是一種慈善活動，參與者將冰水倒在自己身上，然後提名其他人參與，目的是為了提高對「肌萎縮性側索硬化症」（ALS）的認識和籌款。