Reaaallly pretty. I already said that before I think.
I absolutely loved the compositional, rather than technical, focus of the video. Sure the scene choices were restricted, but you set them up in a really logical set of patterns that always worked. I always said good visual structure is key, and this video proves the point. Lots of good key visuals/themes that build up over the whole video. And the editing was really good, where I think some of the internal sync really helped with the execution.
I rather liked the song in the context of the video, actually. Can't see any complaint there as it honestly does a lot of work in setting up the mood here. It made Korean sound rather prettier than I remember hearing it before

Was there lyric sync or did you treat it more as an instrumental?
As far as I can tell, also a very side-story oriented video which is always nice to see (I guess the limited scene selection gives it away, but in this case that's a very good thing). I can't comment much on series context or anything, but I don't think anything here confused me. All quite plausible.
Anyway, lovely job. Really strong romance video, definitely a favorite of mine in the genre!
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