問：1. Q: What is Secret?
答： A: Secret is a South Korean girl group formed by TS Entertainment in 2009.
問：3. Q: Who are the current members of Secret?
答： A: The current members of Secret are Sunhwa, Hyosung, Zinger, and Soo-jung.
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.
