[BLACKPINK - 9 members] PINK PUNK PROFILE | K-POP ENTERTAINMENT 191228 EP.1

These were the members of BLACKPINK before the official debut. Their previous name was PINK PUNK, consisting of nine members: Jennie Kim, Euna Kim, Jinny Park, Chaeyoung Park, Miyeon Cho, Hanna Jang, Jisoo Kim, Eunbi Kim & Lalisa Manoban.
Because of the multiple postponing of their debut and other reasons, members started to leave one by one until there were only four members left.

Based on what I've read:
EunA left YG because of the fierce competition between the members.
EunB left YG because of her health.
Jinny left YG because of the low chance of debuting after not making the cut for BLACKPINK.
Miyeon left YG because her debut kept getting delayed.
Hanna left YG because of the low chance of debuting after not making the cut for BLACKPINK.

Видео [BLACKPINK - 9 members] PINK PUNK PROFILE | K-POP ENTERTAINMENT 191228 EP.1 канала K-POP ENTERTAINMENT