i like watching Korean movies in original (and, which is important, without subtitles too - so that I've nothing but to focus on what's being told). as soon as you keep hearing a word or a phrase often you will surely get it distinguished, and then - remembered. just try to look up for it in the dictionary too - in order to be sure you've heard it correctly. this way of learning has serious advantages - 1) you don't get bored 'cause you choose what to watch by yourself; 2) you get most important and useful words first; 3) you not simply learn new words, you learn them from the very start with examples of situations they could be used in. and your level does not really matter at all - I've started knowing nothing about Korean at all and I'm pretty sure it helped me alot until now and will remain very helpful in the future as well ))