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：冰桶挑戰對ALS研究的影響是什麼？ 答：冰桶挑戰成功地提高了公眾對ALS的認識，並為研究籌集了大筆資金，加速了對該疾病的研究進程。