So, I purchased the lifetime license so I could access all the content.. I have to say that this is actually a really good app and it is definitely worth the money! I am a polyglot and I'm learning lots of languages. Korean has so far been really difficult for me to the point that I wanted to give up on it. This app slowly builds up the language for you without complicated explanations. Now I actually feel I can learn this language! Points for improvement: add one extra exercise for each unit where you have to type the whole sentence by yourself. Also, in the quizzes, when you press an answer, have it play the audio again so that we have more exposure. Maybe add a 1000 most common words flashcard list to it with spaced repetition. Have a look at Ankidroid or Semper for inspiration 🙂 thanks for this app!