The song has snagged #1 on multiple charts, and the accompanying "Better Off" has also placed high on the charts. Member Jonghyun wrote the lyrics to "Selene 6.23" himself.
The new album is a combined repackaged album as it contains both chapters as well as two new songs - "Selene 6.23" (Korean title is 'The Distance Between Us'), and "Better Off".
"Selene 6.23" features an orchestral narration as well as piano melody making for an emotional ballad, while "Better Off" will be a medium-tempo pop ballad that expresses the sadness associated with goodbyes.
Source: Osen via Naver