SUPERSTAR BTS

IOS
Switching App Store Regions:

Go to "Settings"
Go to "iTunes & App Store"
View your Apple ID (enter your password if necessary)
Go to "Country/Region" and change your country or region to South Korea (it should appear last on the list as "대한민국")
Click "Next" and then click "Agree" to accept the terms and conditions
Enter a random South Korean address (a friend looked up a random South Korean hotel and used their address, seems to have worked!)
Your iTunes App Store has now been switched to South Korea
Search for "SuperStar BTS" in your App Store and download!

Making a completely separate Korean iTunes account:

Go to the "App Store"
Scroll all the way to the bottom, sign out of current account
Tap on "Sign In" then "Create New Apple ID"
Tap on the space above "Agree to Terms and Conditions" to select the region "Korea, Republic of"
Tap on cancel, your app store should change to the South Korean App Store
Find any FREE app and tap on install, then "Create New Apple ID" [THIS ENTIRE STEP IS CRUCIAL, DO NOT OVERLOOK]
Proceed to enter in required information to make a new Apple ID.
Random South Korean address can be googled.
Search for "SuperStar BTS" in your App Store and download!

ANDROID
Go to https://apps.qoo-app.com/en
Download the APK on phone or PC and transfer to Phone
Search up Superstar BTS on the App and download it and install
The game will update on this app and you wont lose progress