“Beautiful” is BTS' promo song released not long after their debut in 2013. It features the melody and instrumental from “Beautiful”, a song by Mariah Carey featuring Miguel.

For this promotional activity, BTS members split into two sub-units. This song is the product of Jung Kook, V, Jimin, and j-hope, while the other members RM, SUGA, and Jin released “Adult Child (어른아이).”