Second series of BTS albums, which began with The Most Beautiful Moment in Life Pt.1 album, also containing The Most Beautiful Moment in Life Pt.2 and The Most Beautiful Moment in Life: Young Forever. However, with the release of the Youth album in 2017, an album consisting of versions of some Japanese songs plus 3 original Japanese songs, and having a continuation of the story, is included in this Youth Trilogy series.  

Series also known as "The Most Beautiful Moment in Life Trilogy", "Hwa Yang Yeon Hwa series" or "HYYH series"

An Era that addresses the process of transition from youth to adulthood, "a youth adrift". In this Era began what we know as BU, BTS Universe, a fictional history full of theories and teachings.