If you want to get SUPERSTAR BTS for your iPhone just follow these steps.

-Open up the App Store & click on your account at the top
-Select ‘County/Region’ & scroll down to find ‘Korea, Republic Of’ & agree to the terms

-Switch the payment method to “None”
-Type in a random name(this doesn’t really matter)
-Street= Gwanak-ro
-City= Gwanak-gu
-Country= Seoul
-Postcode= 151-742
-Phone= #82 55555555 (this is just so it knows it’s Korean)

-Press next & it takes you back to the App Store
-Type in bts or superstar, find the App & select GET

After the App has downloaded it’s safe to return to your country/region. You just need to fill in your Apple ID details again to return to your normal App Store.

*I have found that when the app needs updating you have to change the store again to update it. I just follow these steps when I need to update it & then when it’s updated return to my store*

I hope this helps :)