Question: 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?
Context: Danny Ahn (Korean name: Ahn Shin-won; 안신원; born December 22, 1978) is the main rapper of the South Korean boy band g.o.d.  He is notable for his unique rapping.  He attended Department of Theater/Acting in Dankuk University. Ok Taec-yeon (; born December 27, 1988), known mononymously as Taecyeon, is a South Korean rapper, singer, songwriter, actor and entrepreneur.  He is the main rapper of the South Korean boy group 2PM. VIXX LR (Korean: 빅스 LR ) is the first official sub-unit of South Korean boy band VIXX formed by Jellyfish Entertainment.  Established in August 2015, VIXX LR consists of VIXX's main vocalist Leo and main rapper Ravi.  The sub-unit debuted with their first mini album, titled "Beautiful Liar" on August 17, 2015. Ok Taec-yeon, composing as Taecyeon a.k.a TY, is a South Korean actor, entrepreneur, singer, songwriter and the main rapper of the South Korean boy group 2PM.  In 2012, Taecyeon teamed up with his fellow Dankook University alumni students to produce a digital album and then began writing and composing songs for his solo stage at 2PM Japanese Concert, 'Six Beautiful Days' in Budokan.  Taecyeon started actively participating in writing and composing songs for 2PM the following year. Kim Nam-joon (Hangul: 김남준 ; born September 12, 1994), better known as Rap Monster, is a South Korean rapper, songwriter, and record producer.  He is the main rapper and songwriter of the South Korean boy group BTS, managed under Big Hit Entertainment.  In 2015, he released his first solo mixtape, "RM".  To date, he has recorded with artists such as Wale, Warren G, Gaeko, Krizz Kaliko, MFBTY, and Primary. Jang Dong-woo (Hangul: 장동우; hanja: 張東雨; born November 22, 1990), commonly known as Dongwoo is a South Korean singer, rapper, and actor.  He is the main rapper of South Korean boy band Infiniteand Infinite H. Tens of thousands of South Korean soldiers were captured by the North Korean and Chinese forces during the Korean War (1950–53) but were not returned during the prisoner exchanges under the 1953 .  Most are presumed dead, but the South Korean government estimates some 560 South Korean prisoners of war still survive in North Korea.  The issue of unaccounted South Korean POWs from the Korean War has been in dispute since the Armistice in 1953.  North Korea continues to deny it holds these South Korean POWs.  Interest in this issue has been renewed since 1994, when Lt. Cho Chang-ho, a former South Korean soldier presumed to have been killed in the war, escaped from North Korea.  As of 2008, 79 former South Korean soldiers have escaped from North Korea. 2PM (Hangul: 투피엠 ) is a South Korean boy band formed by JYP Entertainment.  The current members are Jun.  K (formerly known as Junsu), Nichkhun, Taecyeon, Wooyoung, Junho and Chansung.  Former leader Jay Park officially left the group in early 2010. Jung Il-hoon (; born October 4, 1994), simply known as Ilhoon, is a South Korean rapper, songwriter, record producer, and actor.  He is the main rapper of the South Korean boy group BtoB.  He is well known for his multiple song featurings with artists such as Hyuna and G.NA and as an assistant MC in the variety show "Weekly Idol".  Ilhoon made his acting debut as he starred in the drama "Webtoon Hero: Tundra Show" in 2015.  He was also known for inventing and popularizing the gestures for "Gwiyomi Player". Cha Sun-woo (born September 5, 1992), better known by his stage name Baro, is a South Korean singer, rapper, and actor.  He is the main rapper of South Korean boy group B1A4 and debuted alongside with the group on the stage of MBC "Show!  Music Core" on April 23, 2011.  He made his acting debut through the hit 2013 cable drama "Reply 1994" and additionally received critical acclaim for his role in the 2014 drama "God's Gift - 14 Days".  Baro won 12 medals in Idol Star Athletics Championships with 3 golds, 7 silvers and 2 bronzes.
Answer: Jay Park