DAY6 (데이식스) is a South Korean rock band under JYP Entertainment. The group marked their debut on September 7, 2015 with EP "The Day", which peaked at No.2 on Billboard's World Album Chart a week following its release. The band consists of five members: Sungjin, Jae, Young K, Wonpil, and Dowoon. Originally a six-piece band, DAY6 became a quintet after keyboardist Junhyeok left in February 2016. All of the DAY6 members are majorly involved in writing, composing and producing the band's music.
DAY6 has been known to not pertain to any genre boundary. Such reputation was proven largely by their year-long project Every DAY6 in 2017, wherein the band would release two songs every month of the year. By the end of the project, 25 songs were added to their discography, genres of which ranged from hard rock and upbeat sing-a-longs to mellow ballads. Their first full-length album Sunrise, consisted of songs released in the first half of the Every DAY6 project, was number 14 on Billboard's The 25 Greatest K-Pop Albums of the 2010s: Staff List, and the project kick-off song "I Wait" was placed No.81 on Billboard's The 100 Greatest K-Pop Songs of the 2010s: Staff List.
On August 31, 2020, DAY6's first subunit, DAY6 (Even of Day) made their debut with the mini album "The Book of Us : Gluon - Nothing can tear us apart", consisting of members Young K, Wonpil and Dowoon.