This is a brief overview of their history. For a deeper look please refer to these links! baby v.o.x neocities namu wiki

Baby V.O.X is a five member girl group that debuted in 1997 under DR Entertainment. Baby V.O.X, meaning baby Voice Of eXpession. are known for being one of the top girl groups of the 90s and 2000s. Baby v.o.x had multiple lineups including original members jeong siwoon, jeong hyeonjeon, and cha yumi who were active during the first album. kim ez and lee heejin were also active during this time and are the only members that were in the group from debut to hiatus/disband period. Towards the end of the first album promotions, cha yumi had left the group and miyoun was eased into the group to join the other members for the second album. shim eunjin and lee gai then went on to replace the other two members that left (jeong siwoon and jeong hyeonjeon) with this new lineup, there was also a change in concept following the second album to keep up with other girl groups at the time, s.e.s and fin.k.l. At the end of second album promotions, lee gai would also leave the group and be replaced by yoon eunhye. Baby V.O.X continued with a third album that was very successful but also came with more challenges for the group. Rumors were spread about member miyoun and H.O.T member moon heejun causing a wave of antifans that led to the mental and physical harm of Baby V.O.X. See here
** writing the rest later because I am lazy ^^ **