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 "Eun Ji-won"): Eun Ji-won (born June 8, 1978) is a South Korean rapper, host, dancer, composer and leader of the first generation idol group SechsKies (젝스키스).
Relevant evidence: Yes