How do you say "They must be cute/smart" in Korean?
I was chatting with someone online and we were talking about her children. I wanted to say "They must be cute" as in "I imagine they are cute".

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If you are talking and suddenly you realized that they are cute,
애들이 귀엽군요.

If you have limited evidence that they are cute,
애들이 귀여운 것 같아요.

If you haven't seen them,
애들이 귀여울 것 같아요.

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My pleasure.

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Thank you! Perfect.

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They must be smart ---> 아이들이 똑똑한 거 같네요.

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I would say 아이들이 귀엽겠네요 in that situation. You might be imagining what the chidren would be like from your friend's description, right?