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Her and Mysta were friends in their respective past lives.
I know this because I used to stalk Mysta's PL tweets and once when he was in a depressed mood I saw her comforting him.
Of course I didn't think heads or tails of it at the time. Just "huh, so he knew the girl who did his alerts before debuting". So I didn't bother to screenshot anything.
It's gonna be a pain in the ass to confirm since she's privated her account, but I'll do my best.
You don't need to believe a stranger on the internet but yeah, her and Mysta have been friends for a while.