Google recently made a stand-alone version of its Text-to-Speech Engine available in the Google Play Store for Android devices.
The engine is used by several apps, such as Google Play Books, to translate text into spoken words. Before Google made the app available separately, it was part of the Android operating system. Google has been systematically pulling apps out of the Android operating system so that they can be updated separately and not through operating system updates. Text-to-Speech is the latest such app.
This new version of the app adds support for the Korean language, and can be turned on/off by users in the settings tools. Text-to-Speech is free to download.