Study Korean, TOPIK vocabulary 3/4 There is a problem with Korean voices not being heard correctly on some Android devices. If you cannot hear the correct audio, please download Speech Recognition & Synthesis and Korean audio data. 1. Download Speech Recognition & Synthesis from Play store 2. Device settings > Language and input > Text-to-speech output > Preferred engine > Select Google text-to-speech 3. Press the settings button next to Google Text-to-speech > Settings > Install audio data > D