DAY6 (Hangul: 데이식스) is a South Korean rock band formed by JYP Entertainment. They debuted on September 7, 2015 with the extended play The Day with the single "Congratulations". The band has five members: Jae, Sungjin, Young K, Wonpil, and Dowoon; Junhyeok left the band in February 2016. JYP Entertainment initially announced the band as a five-member band called 5LIVE, composed of Sungjin, Jae, Young K, Junhyeok, and Wonpil. The band began promotions as 5LIVE in 2014