The whole thing just screams of jealousy to me. Jessica would still be able to focus on the group full time. She would have hired a Manager to run things when she was off promoting with the group. And then Krystal always getting on popular dramas and even a few movies at the time. She was everywhere. I still feel like Taeyeon and Tiffany were the main ones who were against Jessica.
I have always felt that J & K was more the reason than B & E. B & E was a handful of sunglasses at the time. but saying they hated a fully sanctioned duet of the jung sis is horrid optics.
Post 9/30 Krystal pretty much hated the ground SNSD walked on. Collapsed at the sm town in Oct 2014 and never went again until that final one in 2019. the only concert f(x) had in Korea snsd was in Taiwan so Jessica and Red velvet were at the concert.
Krystal may have actually been senior to snsd with all the acting commercial gigs she did as a kid. Although fx was surely junior.
But J & K was a brand. SM had spent considerable effort building that brand.
They always got solo stages at sm town.
J & K the show was a Hit, and had already been offered a season 2.
J & K had cut an album, this was pre any solo stuff by Amber, Taeyeon, or Tiffany.
pretty sure both left the dorms first to live at home together with the folks.
Jessica had always been top 3 no matter the country. And OFC Krystal was Krystal.
as to Taeyeon and Sooyoung's siblings
Taeyeon does have a younger sister(and an older brother), but she is a 98. Her family is from a long ways away so i doubt she wanted her in pre 2012-14 ish. (Haeyeon did join sm we think for a bit after RV debut, but she went solo with youtube covers ect in like 2015.) she released a digital single in 2020 with some no name agency.
Sooyoung has an older sister who has done musical theater. Soojin is a 86 and 3 years older than the bulk of snsd. She was in a tv episode with sooyoung in 2008 ish.
none of the other girls have a younger sister.
Yuri has a scumbag brother.
Yoona has a older sister (5 years)
Seohyun is an only child.
Sunny has 2 older sisters.
Tiffany has an older sister and brother.
Hyeoeon has a younger brother.