How to install APK / APKS / OBB file on Android
Korea Subway Map, include:
1.Seoul Capital Area Metro
2.Busan-Ulsan-Gyeongnam Area Metro
3.Daegu Metro
4.Daejeon Metro
5.Gwangju Metro
6.Incheon Subway.
7.KTX Trains map
it can use in offline mode, no internet environment.