its adverb
The proper noun Korea (a region, two countries) has the proper adjective Korean (adjective and demonym).
no
korean
"Korea" is a proper noun because it refers to a specific place - a country in East Asia.
Korean
The following are restricted items that should not be imported into Korea without proper documentation
they dress like people in south korea
Yes, it can be, used as the proper adjective for the proper noun Korea (Korean peninsula, Korean food). Korean is also a noun, for the language or as a demonym for a person from Korea.
The proper noun North Korea (a country) has the proper adjective North Korean. It is also a noun for a person from that country (a demonym).
The proper adjectives are:KoreanPolishAlaskanBelgianSwedishFrenchRussianCubanPeruvianIndian
Russia, Mongolia, Korea, Japan, and India