Do you know any dictionary of Korean showing the pronunciation of each word like the example below? That would be a great resource.
Another question: is there any equivalent version of toPhonetics (formerly lingorado.com) for Korean?
The National Institute of the Korean Language's Basic(/Learner's) Korean Dictionary has pronunciation for each word in both written and audio form. For example, here is their entry for 까맣다:
This is my prefered dictionary for this because not only is it available for their basic Korean dictionary, but also for all their translated learner's dictionaries (something the other's don't have; see below). See my other answer for a more complete review of this dictionary.
To share, I know of an offline app resource called Beginner Korean (https://play.google.com/store/apps/details?id=com.shex.beginnerkorean) that is meant to help you learn the common Korean words, their meanings and pronunciation.
The only trouble with this 'solution is, you'd have to learn from scratch.
The mobile version of the Naver Korean-English dictionary for learners also contains audio for words. You can access it from the web here.