This app is absolutely excellent.
I quickly became obsessed with the South Korean culture (yes, the k-pop too!) and so I really wanted to understand the language. I browsed the Internet for some ideas on how I should start, and found that more often than not people were recommending learning hangul first, which is the korean alphabet. Although learning the alphabet hasn't helped me with knowing what any words mean, I was still able to read (sound out/romanize) signs and letters and posters and things of that nature. Now that I'm learning words and grammar, I believe knowing the alphabet and what sounds all the characters make has made it ten times easier with pronouncing and learning the words. Not to mention, even if you don't know what the words mean, your friends will think it's pretty cool you can read it ;)
I highly recommend buying the full version of you'd like to continue learning Korean.
감사합니다 <3