Thank you so much ^♡^
Chaeyoung might have joined in 2012 and the song came out in 2012, so it could be her but not sure if it’s true. Or I think it could be Miyeon? Or it could even be someone who left?
If you’re talking about the girl with Laliz in these photos, then yes it’s Park Chaeyoung.
Hello :) The one that left is Euna Kim and she is now in a girl group from Music K Entertainment called The Ark. The current officially confirmed members are Kim Jisoo and Jennie Kim. I think it’s safe to say Kim Eunbi and Lalisa are confirmed as well. (These answers are in our F.A.Q/message page.) You can hear Lalisa sing from an old video here.