A free app for Android, by hiuhome.

BTS Wallpaper App is a free photo application for Android devices. This application has a collection of high-quality wallpapers from the Korean boy group BTS (also known as Bangtan Boys). You can set any of the wallpapers you like as your lock screen or home screen. The BTS Wallpaper App has a simple interface that lets you browse the collection quickly and easily. You can also download the images you like to your device for free. 

The app has several categories, such as BTS, singer, rapper, band, and others. The images are sorted by popularity, rating, date, and keyword. You can also add your own images to the favorites.