Korean language is different from its neighboring China or Japan. Korea has its own distinct language and writing.
Korean alphabet consists of 25 letters and it was invented by King Sejong of Chosun Dynasty in 1443.
If you are planning to stay in Korea for an extended period of time, you may want to consider learning Korean writing(Hangul).
Speaking and listening Korean may be difficult to learn but simple reading is quite easy to learn. It usually takes a few days (two hours per day)
to learn to read Korean writing because there are only 25 letters in Korean alphabet. It is one less than English alphabet of 26 letters.
For more information about Hangul, see https://en.wikipedia.org/wiki/Hangul