The Korean Language
The Koreans are one ethnic family speaking one language. They share certain distinct physical characteristics which differentiate them from other Asian people including the Chinese and the Japanese, and have a strong cultural identity as one ethnic family.
The Korean language is spoken by more than 65 million people living on the peninsula and its outlying islands as well as 5.5 million Koreans living in other parts of the world. The fact that all Koreans speak and write the same language has been a crucial factor in their strong national identity. Modern Korea has several different dialects including the standard one used in Seoul and central areas, but they are similar enough that speakers/listeners do not have trouble understanding each other.
Why not learn some useful Korean phrases?