The Most Beautiful Moment in Life, Part 2 (Hangul: 화양연화 pt.2; RR: Hwayang-yeonhwa pt.2) is the fourth extended play of South Korean boy group BTS. The EP was released on November 30, 2015, and is the second album for the group's two part series centering on "Youth". The album was released in two versions, nine tracks, with "Run" as its lead single. In South Korea, The Most Beautiful Moment in Life, Part 2 was the fifth best-selling album of 2015.

Earlier in September, the group announced their comeback with a prologue trailer, featuring a new track called "Butterfly". They also announced a domestic concert from November 27 to 29, The Most Beautiful Moment in Life: On Stage, where they would unveil their new single. The news of the upcoming album made #화양연화 trend and rank first in trending topics worldwide on Twitter. On November 17, BTS released an animated comeback trailer featuring "Nevermind", another track featuring member Suga's rap from the album. The video showed clips of a boy playing basketball and later chasing a butterfly. Five days later, BTS revealed concept images labeled with a bottom caption: "Je Ne Regrette Rien", which means "I regret nothing" in French; a second set was revealed with the captions, "Papillion", which means "butterfly". A music video teaser was released on the 24th, revealing the name of the new single, "Run".

At the press conference for their concert, BTS explained the concept of their album. They stated: "Part one explained how youth is tiring and difficult, and it also touched on how we feel like we're always on edge. Part two will have a more adventurous and daring feel to it. That's why our title song is 'Run'."Rap Monster added: "We didn't want to just blankly say 'cheer up' or 'be strong'. We really wanted to comfort people our way, by producing the music and writing the lyrics ourselves. We poured our heart and soul into this amazing song".

During their concert tour in support for their album, Rap Monster explained that "Run"'s "B" part, with the lyrics, "make me run more", was not working out during the song-writing process. A melody was suggested by Jungkook but was later rejected as it was deemed "too good that...other parts could not stand out that much". For the final composition, V's melody was ultimately used with Jungkook's original lyrics.

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