An adjective is not always used to differentiate one noun from another. If you have mentioned several of the same noun and you wish to differentiate between them, then an adjective will help.
- There are two cars there.
- Which one is yours?
- The green car is mine.
By using "green" you have cleared up the confusion.
We use adjectives to describe anything - it doesn't matter how many of them there are. There is no reason why someone could not say "I have been to dynamic Korea" in the same way they might say "I have been to beautiful Greece". They are just giving their opinion of the country.

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