Simple is Best. Keep the features you want as simple as possible.
Since OS Android 6.0, you may encounter a hang while running JC Korea Radio II.
You can select the app you want to use during battery optimization in the device “Settings”, or disable the function in the “Battery usage optimization settings” app.

It supports streaming service of many Korean FM broadcasts except for some broadcasts.
Android Auto is also supported, so while driving in the metropolitan frequency / Busan / Daegu / Daejeon / Ulsan frequency, enjoy a noise-free FM radio anywhere in the country. ^^
Local broadcasts will continue to be updated. (Some broadcasts are not supported.)