Awww Dawoon is such a good friend/noona.😩 I know Jaeyi must be having a hard time tough. It looks like you guys forgot Fox face gave Jaeyi an ultimatum. She has to basically cheat on her boyfriend to get the picture remember? Though she doesn't have all the facts yet, I do think she'll tell Dawoon about the account.
It's better if Jaeyi tells him before he finds out from someone else, anyway. I don't think he'll hold it against her. She's definitely being faithful to him. And if he knows that she's spilling the beans on her past in order to help Dawoon, he'll be ok.