OP says their friend worked as part-time staff at ISAC eSports (at the last one as well) and told stories about Chuu and Olivia Hye: https://twitter.com/J3__loona/status/1311596836424019968

"They said it was so cute how Jiwoo played hard and also hummed to herself sometimes, and whenever their eyes met, she smiled every time and kept asking if my friend wasn't feeling hotㅠㅠ"

"During filming, they were at a structure with a gap in the ceiling and Jiwoo put a cushion up to block the sunlight, so my friend thought she just wanted to block it out while she played"

"But Chuu told my friend to stay under the cushion's shade since it's so hot.. (Said they were so thankful how Jiwoo looked out for them being hot, when Jiwoo herself was wearing long sleeves because of sponsorshipㅜ)"

"And my friend tried to make a shade for Hyeju with a cushion too, but it was a bit too far to reach, so Hyeju moved aside slightly to make room, and then Jiwoo immediately said "I'll climb on this chair to put it up!!" "

"During the actual filming they had to take down both cushions. Jiwoo set it down on the floor while Hyeju was about to just sit on it again, and Jiwoo said "The plastic (chair) and the cushion (fur cushion..ㅠㅠ) are different temperatures!" so Hyeju also set hers downㅋㅋㅋ"

"Also Hyeju gave Jiwoo an Ice Breaker (candy) and also to my friend ㅠㅋㅋㅋㅋ (Friend comment: Is she an angel?)"

"Due to the strong light on the roof the phone screens weren't visible so Jiwoo was like "Is everyone looking where they shoot hing", and when the cloud covered the sun briefly Jiwoo said "The shade, please don't go away, dear cloud~""

"And Hyeju said it was hot and the sunlight was glaring, but she talked a lot with Jiwoo stillㅋㅋㅋ..
"

"The scenery was pretty, so Jiwoo said "We just came here to see the scenery hehe" (that cheeky cuteness she has? From my friend's telling it was that kind of nuance ㅋㅋㅋ..)"

"And when they were talking it was a bit cloudy, so my friend showed her a photo from when it was sunny and she really liked it, "Whoa it's so pretty" (つ˘◡˘)づ"

"And my friend told Jiwoo that a friend is a fan so they also like her, so she went "Whoa really, then how about ~~ in our group?" And asked various thingsㅠㅠ What a mischievous cutie..
(Friend didn't know much detail and was disappointed they couldn't answer that well..ㅠ)"

"The phones heated up (it was outside on the rooftop with no ceiling, so it's hot even if you sit still ㅜ) so they periodically cooled with ice water while playingㅠ"

"But there must have been an Internet problem during the solo round, everyone at that table (the one with GWSN) got dropped during that round and they weren't able to play after that pointㅠ"

"So the girls reported afterwards that they were dropped, and the official said they'll let those four play an extra round, and all four were excited"

"There was an announcement of a 3-minute bathroom break,
"Should I go?"
"Unnie you can't make it ㅎㅎ"
"Heheh right I can't"
They had this cute conversation while messing aroundㅜㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋ"

"Lastly they had this stage effect with noisy smoke coming out from bottom, and they tested it without warning, so my friend said "That scared me!" and Jiwoo also got surprised and went "That was scary wasn't it!" ㅠㅠㅋㅋ And they just kept talking about how adorable it was"