Learning to read Korean can be accomplished in an astonishingly short time. It might look impenetrable but the written language is made up of jamo, the building blocks of the written language. There are 51 in total, 24 of these are the equivalent to letters of the Latin alphabet. 14 of these are consonants and 10 are vowels. The others are clusters of these. Sounds complicated but it really isn't. Once you get a handle on the basic sounds you can start to sound out words and you will be astonished to find out just how much English is disguised in Korean. Couple that with some simple vocabulary and your trip can be made a whole lot easier. It is said that a diligent student can learn to read Korean in 24 hours.
Google it and choose the best site for you but for some basic background on the written language check Wikipedia.