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Spoiler don't read if u don't wanna get spoiled
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It is possible lol they're a couple actually (don't know if my translation was accurate but their avatar was hugging and they had hearts and pink aura around them talking about matching/pet names(?)) Lolol (sorry to burst the hyejin x yoona ship bubble)
may Hyejin and Yoona end up LOL who am I kidding