'BORDER : DAY ONE' is ENHYPEN's debut and first mini-album. The album talks about ENHYPEN's true emotions as they began their  career as an artist. and a team. The boys conveyed the happiness  of debuting and anxiety of taking their first step into an unknown future. 

The concept is illustrated through two concepts, 'DAWN' and 'DUSK', representing their complex emotions while trying to connect, discover, and grow together at the border.

The album consists of six tracks: “Intro : Walk the Line”, lead single “Given-Taken”, “Let Me In (20 CUBE)”, “10 Months”, “Flicker”, and “Outro : Cross the Line”, which anyone can relate to.