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：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。