The album was released on January 13, 2014, by WM Entertainment and their distributing label Pony Canyon Korea.

On December 31, 2013, WM Entertainment released teaser photos for the B1A4's 2nd Album on their official website, including a group picture and an individual teaser picture for each member.

On January 2, B1A4 released a music video teaser for Lonely (없구나).

On January 6, B1A4 released a music video teaser drama version for Lonely (없구나).

On January 9, B1A4 released a medley teaser previewing 15 seconds of each song.