I have watched this drama special 4 times and have loved it every single time.

Both Kim Seul Gi and Doo Joon do a great job.

There aren't any characters that I can sincerely hate. A few become annoying for a few seconds at most.

I don't really enjoy time travel (although I have watched many dramas/movies relating to it).
I found the time travel in this okay and non- headache-inducing.

The music can't really be complained about.

All in All, if it's not your cup of tea, you've only lost 2 hours.