Sechskies is a six member South Korean boy band that includes what South Korean rapper whose first solo single was "A-Ha"?
Sechs Kies: SECHSKIES (pronounced as , Korean: 젝스키스 , Japanese: ジェクスキス ) is a six-member South Korean boy band in 1997. 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.
i don't know