: The most famous collaboration for the BSS unit is "Fighting (feat. Lee Young-ji)" , which became a massive "cheer-up" anthem globally.
: They originally planned for 17 members, but 4 trainees left before debut. Seventeen 301
The sub-unit consists of three members: Seungkwan , DK , and Hoshi . The number 301 is a common shorthand or "code" used by fans (Carats) to represent this specific trio: 3 members in the unit. : The most famous collaboration for the BSS