Still don’t understand about Heechan and friends’s group chatting.
What did they do? Stay low from what? If I miss something??

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    I don’t really know either. I just decided they were talking about not being too flashy with the “competitions” they were “winning”, ie, ‘be more subtle about the crazy perks we’re getting so X doesn’t come after us too.’

    …I feel like it was done to add suspense but the show didn’t really have a good reason for it so they just ignored it after the fact lol

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      At first I thought, they are X (some secret organization – too much read manga back then 😅)
      But then when we already know Tae woon is X, the revelation about their identity (after incident of math competition) feel anticlimax for me, and writer-nim didn’t explain it any further

      But yeah because Tae woon is awesome, so I choose to ignore this plot hole 😅😅

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