Woo Ji Ho (우지호; born September 14, 1992 in Mapo, Seoul, South Korea), better known by the stage name ZICO[/ b] (지코), is a South Korean rapper. He is the leader of the boy group Block B. ZICO is notable for his successful crossover skills, maintaining an underground reputation with mainstream hip hop appeal even as a Korean idol. He has produced both successful K-pop and Korean hip hop music. Prior to debuting with Block B in 2011, ZICO released his first solo mixtape in 2010 titled "ZICO on the Block". By October of 2012, he released an extension of the first mixtape, an EP by the name of "ZICO on the Block 1.5".