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In the sentence, 걱정된다 얘, this '얘' is an expression that women usually use to address each other Its comes from 이 아이야. This gives the sentences a very feminine touch
So when a girl's friend cooked for her, she can say 진짜 맛있다 얘. and it means the same thing as 진짜 맛있다 or 진짜 맛있어, but adding that 얘 makes it sound very feminine.