The grammar and phonetics of Korean are quite different from those of most European languages. The Korean alphabet, Hangeul, was originally invented by King Sejong in the 15th century. Hangeul is a phonetic alphabet with 24 letters and is very easy to read and write. The Korean language has many other interesting linguistic and cultural features, such as multiple speech levels, honorific expressions, and different particles that indicate grammatical relations in a sentence.
Korea has been shaped by the influences of other countries in Asia like: India, China, and Japan. While the cultures and languages different in many ways. They do share some similarities when it comes to languages. Learning one of their languages makes learning one of the others a lot easier because of similar grammar structure, politeness rules, and borrow vocabulary.
Speaking Korean is of course advantageous primarily only if traveling or living in Korea, but ability to read it will sometimes allow you to get cheaper prices in Korean shops in the country and in Korean-owned shops in the US. Speaking it can also get you free extra or generous portions of food from pleasantly surprised cooks in Korean restaurants, especially if the restaurant is in another country, such as Japan, Canada, or in most large cities in the U.S.