Question: Sechskies is a six member South Korean boy band that includes what South Korean rapper whose first solo single was "A-Ha"?
Sentence (from "Sechs Kies"): Consisting of members Eun Ji-won, Lee Jai-jin, Kim Jae-duck, Kang Sung-hoon, Ko Ji-yong and Jang Su-won, the group debuted on April 15, 1997.
Relevant evidence: Yes