I’ve got an iPhone on christmas and had to download all Kpop apps. One app was really awesome : KBS Sukira kiss the radio with Ryeowook and Sungmin. You can listen to them for FREE! It’s always between 10pm and 12pm and if you are an E.L.F you must have it. One disadvantage is that you can only hear them not watch. But it’s enough to hear their voices

Here are a few pics:
Which K-App’s would you guys recommend?