So, this song happened to me.
Now, the thing is, I don't know a thing about Infinite except that they had the song The Chaser(?), which I've never actually listened to, and I know one of their members...somewhat (Myungsoo).
I was listening to a "Kpop Dance" station on an app I downloaded and I came by this song. The app didn't tell me the title or anything so I had to look it up.
I'm pretty hooked on this song.