First things first, I was really disappointed that Red Velvet wasn't in this song. Now that that's out of the way. I was a little confused with what the storyline of the video was. My thoughts are that the short haired girl was in love with the other girl and didn't know how to tell her. She kept getting discouraged and finally told her friend to leave. I'm not sure about how accurate that is, but that's the vibe I got from it. Also, SM, if you're going to have talking in a music video, please add subtitles. It makes it so difficult for us foreigners to understand what's going on.
Of course, I love this song because it's Red Velvet. What else can I say about that? But the song is very back-and-forth-swaying kind of music. It's got a nice smooth and gentle groove to it.