There are advertisements in the tool. Many users set up this application on their Samsung and Sony devices. Download the latest .apk file of Learn Korean 4.57 free of charge and have a look at users' reviews on Droid Informer. You will need 12 MB of free disk space to set up the app that is compatible with Android 4.1 and higher.
According to the antivirus report, the app is safe and secure.
From the users' point of view, the benefit of this application is a nice interface, though some people suggest that the weak side of the tool is annoying ads.