Communicate is really hard.. they don't speak English almost at all. Unfortunately it seems that many people consider it useless; the thing is simple: if you go to Korea you have to speak the Korean language. When instead they travel, often are in a group and they pay a Korean guide. Maybe there is a strong nationalism, especially in older generations. Young people normally are more open. I met many nice people, but sometimes it seems that others see you with distrust.
So, remember that once here you'll have many communication problems and sometimes also organizational.