On November 17, an animated comeback trailer was uploaded on Big Hit Entertainment's YouTube channel,[5] which featured the album track "Intro: Never Mind" performed by Suga, RM, and J-Hope.

[6] On November 19 and 20, short clips of each BTS member were uploaded onto their official Instagram account, with clues hinting at an upcoming event related to the album release.

Subsequently, on November 20, Big Hit Entertainment announced the 'Butterfly Dream: BTS Open Media Exhibition' event,[7] which was later hosted on December 1–8 in Seoul.

On November 23, BTS released the first set of album concept photos through their official Facebook and Instagram accounts, accompanied with the caption: "Je Ne Regrette Rien",[8] which means "I regret nothing" in French.

[11] On November 25, a music video teaser for the album's lead single, "Run", was released through Big Hit Entertainment's official YouTube channel.

[13] At the press conference for their concert held the same day, BTS stated: “Part one explained how youth is tiring and difficult, and it also touched on how we feel like we're always on edge.

[14] On the same day, they performed the new songs from the album for the first time at the 2015 BTS LIVE "The Most Beautiful Moment in Life On Stage" concert at the SK Olympic Handball Gymnasium in Seoul.

The 2015 BTS LIVE "The Most Beautiful Moment in Life On Stage" concerts in Seoul, held from November 27–29, attracted 13,500 attendees overall,[16] with tickets selling out immediately after they went on sale.

[28] In the United States, The Most Beautiful Moment in Life, Part 2 debuted at number 171 on the Billboard 200, with 5,000 copies sold, becoming the band's first release to enter the chart.