BSS 1st Single Album 'Second Wind'BSS - the special sub-unit of SEVENTEEN - is officially releasing their first single album, SECOND WIND. BSS stands for BooSeokSoon and is comprised of three SEVENTEEN members: SEUNGKWAN, DK and HOSHI.This first release contains a CDOutboxPhoto Book (88 pages)Lyric Book (8 pages)Photo Card (random 2 of 6)StickerHabit Tracker Mini Card (random 1 of 3)BSS Mini Card (random 1 of 3)Folded Poster.BSS (SEVENTEEN) / 1ST SINGLE ALBUM 'SECOND WIND'