The answer is Korea. The other four countries are all located in Europe. Korea is located in East Asia.
Poland is a country located in Central Europe. It is bordered by Germany to the west, the Czech Republic and Slovakia to the south, Ukraine to the east, Belarus to the northeast, Russia to the north, and the Baltic Sea to the northwest. Poland has a population of over 38 million people and its capital city is Warsaw.
Greece is a country located in southeastern Europe. It is bordered by Albania to the northwest, North Macedonia and Bulgaria to the north, Turkey to the east, and the Aegean Sea to the south and east. Greece has a population of over 10 million people and its capital city is Athens.
Spain is a country located in southwestern Europe. It is bordered by France to the north, Andorra to the northeast, Portugal to the west, and the Mediterranean Sea to the south and east. Spain has a population of over 47 million people and its capital city is Madrid.
Italy is a country located in Southern Europe. It is bordered by France to the northwest, Switzerland and Austria to the north, Slovenia to the northeast, Croatia and Bosnia and Herzegovina to the east, and the Mediterranean Sea to the south and west. Italy has a population of over 60 million people and its capital city is Rome.