: Their 5th Studio Album, HAPPY BURSTDAY (released May 2025), features 13 solo tracks—one for every member—showcasing their individual "proper" musical styles.
signifying they are "Number 1" or their status as the first official sub-unit. Seventeen 301
: They originally planned for 17 members, but 4 trainees left before debut. : Their 5th Studio Album, HAPPY BURSTDAY (released
The "proper feature" related to (the K-pop group) and the number 301 typically refers to their highly popular sub-unit BSS (BooSeokSoon) and their record-breaking hit song "Fighting." 💎 The "301" Connection: BSS : Their 5th Studio Album