Aigoo, I saw this through a few clicks and clicks over at You Tube. Anyway, from the description it seemed that this group Varsity Fanclub has recorded the song (maybe as a demo?) earlier than wuri boys. Well, who sound better? (kekeke) While listening to this version, I'm mouthing Korean lyrics.
Credits to Varsityfanclub YouTube
Here's a photo of them fully clothed. Aigoo, no longer this unnie's type.