Put an adjective or noun + 이다 in front of a noun with -(으)ㄴ to describe it, as in 좋은 카페 or 의사인 친구.
By the end, you can change an adjective or noun + 이다 into its -(으)ㄴ form (좋은, 큰, 긴, 매운, 의사인) and use it before a noun to say what kind of thing or person you mean.
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