What was the first single by the former band member and leader of "1st-generation K-Pop idols" in South Korea?
Sechs Kies:  They are the "1st-generation K-Pop idols" and were named as one of the top boy groups in the 90's. Eun Ji-won:  After the group's disbandment in 2000, Eun pursued a solo career in 2001 with his first single ("A-Ha") and has mainly focused on hip-hop ever since.
i don't know