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：全孝盛有參與演藝圈的活動嗎？ 答：全孝盛除了音樂活動外，也參與了多部電視劇和綜藝節目的演出。