I cant edit my comment. To be more exact, apparently I understood wrong, but I feel like the explanation is not clear enough. In order to get the app to work again you have to:
1) Go to DB LEGENDS on your phone and force stop the app, then clear cache (DONT CLEAR DATA) (DONT START THE GAME YET)
2) Download the APK
3) With DB LEGENDS already installed, open the apk from Yeowang and Update the app (doesnt matter if its the same version)
Thats how I got it working again.