The group debuted as a trio with Moon Sung-nam (vocals, bass), Jung Jae-oo (guitar), and Gang Moon-chul (drums).

Every Single Day was formed in Busan in 1997 by singer and bassist Moon Sung-nam, guitarist Jung Jae-oo, and drummer Gang Moon-chul.

This was followed by Tom's Diary in 2007, and shortly after, Choi Seung-won left the band, to be replaced by Yoo Hyo-jun.

Between 2012 and 2015, Every Single Day contributed music to a number of television shows, including Golden Time, Cheongdam-dong Alice, I Can Hear Your Voice, Miss Korea, Gap-dong, Pinocchio, and The Time We Were Not in Love.

The band subsequently continued their soundtrack contributions with the shows Strong Girl Bong-soon, Confession Couple, Because This Is My First Life, Jugglers, Still 17, and Special Labor Inspector.