The acting, music, writing, scenery, characters, storyline. Everything is absolutely perfect in this drama. After watching 100+ dramas, I have only rated 1 other show a 10. It is that good.

It does take like 3 episodes to get into it, because they're starting slow with the background story, but after that you'll be hooked!

I also never rewatch dramas, but this one and Reply 1988 were the ones I watched two times and would recommend to everyone. The characters are very fleshed out and likeable and compared to other dramas that get worse in the second part, this one only gets better. So if you're considering watching thisn I would absolutely recommend it!