“4 O'CLOCK” is a collaboration between BTS members V and RM as part of the group’s fourth-anniversary celebration, familiarly known by fans as BTS Festa. Initially teased on BTS Festa 2017 skit, fans were made aware that the ballad would expose a different ambience from V’s solo, “Stigma”. On 2016 BTS Festa, RM also collaborated with another fellow member Jungkook in “I Know”.

“4 O'CLOCK” is available for free download through BTS Blog or here: 1 | 2 | 3.