What is the name of the former South Korean boy band leader who left the band in 2010, whose current main rapper was born in 1988?
Ok Taec-yeon: Ok Taec-yeon (; born December 27, 1988), known mononymously as Taecyeon, is a South Korean rapper, singer, songwriter, actor and entrepreneur. Ok Taec-yeon:  He is the main rapper of the South Korean boy group 2PM. 2PM:  K (formerly known as Junsu), Nichkhun, Taecyeon, Wooyoung, Junho and Chansung. 2PM:  Former leader Jay Park officially left the group in early 2010.
Jay Park