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Someone who went to Choerry and Olivia Hye's school and was in the same class as Olivia Hye shared some stories:

Olivia Hye was really shy and Choerry was really social

Choerry had lots of friends, and she looks way better IRL

src https://gall.dcinside.com/mgallery/board/view/?id=girlsofthemonth&no=359609&page=1

They first transferred to the school together, but Olivia Hye hadn't debuted yet. When students asked if they knew each other, they pretended not to.

"Olivia Hye's hand-mirror is super self-loving lol I heard making third-party LOONA content wasn't allowed? But there's a ton of different stickers of her on that mirror"
OP asked to take a picture of the mirror but never actually did apparently :[

"Olivia Hye didn't go to school as often as Choerry but when she did she was often... asleep... She only studied hard for Japanese with her book out, I think she was preparing for a Japanese debut. I don't know about Choerry I wasn't in her class"

"Oh and within our class, she only really talked to me and her friend. After we all took grad pics, she said "cya next time, I'm going to take pics with Choerry" then she never showed up to school again then dropped out, I never saw her again ... liar"

"One thing that made me think 'wow celebs really are different': at school she was really low-energy and slouchy but when it was time to take grad pictures suddenly she changed her expression/pose to get a good shot. Even the teacher was like omo omo she really is a celeb huh"

"She really was shy though, when she said bye for the last time it was the first and last time she started the conversation... Before then I had to go up to her, but she'd kinda just respond while being shy"

Did Choerry/Hye hang out together at school after Hye debuted?
Yeah but Choerry had lots of friends in her class so she was always surrounded by people but Hyeju was so shy even whenever anyone tried talking to her. And if she felt lonely she'd go to the other class, and
[...]

[...] then ask someone to get Choerry for her, and the two of them would go off somewhere.

How was Hyeju's way of talking?
She kinda talked without really moving her lips, so the pronunciation would get a little loose sometimes, she was just really low-energy [...]

[...] I saw her on broadcasts and she talks with like 5x the usual power on camera

Did she typically look like this? (shows gif of Olivia Hye slouching backwards at Fact In Star)
No it's even more than that, she was basically merged with her desk at school

Did Hyeju diet hard even while eating at the school cafeteria? She lost so much weight;;
OP never saw her eating school food. She'd typically only attend AM classes or if she had to have attendance, she'd visit the school staff room then leave.

(+ OP apparently posted a pic of the mirror but then deleted it afterwards in case it became an issue)