when I first saw this clip, this was exactly what I noticed too.
me and my man ride back from office in our car / bike, and I like seeing him in the rear view mirror. And we would stop at the red lights winking at each other and jamming to the song I have playing in the car!
the way tae kept subtly checking the rearview mirror, only for us to realize Jungkook was riding behind him ...one of the prettiest moment, peak married behavior😭