I'll keep this short and major spoiler free, a little word of advice I can give is that if you want to leave this drama with a happy ending, end at episode 35, if you would like to see a tragic ending, watch till the end
All in all this is a very well acted story with intresting twists and turns, but I wouldn't recommend anyone to rewatch it since its a little bit predictable. I heard they cut down the episode length of it, which makes sense considering how slighly weird the editing can be at points. I think that its initial premise is good, but it unfortunatley fails to fully deliver after the halfway point. That doesn't mean its bad perse, but that it falls victim to the typical issues that plauge many c-dramas, misunderstandings for misunderstandings sake. Even when the characters are intelligent and could just clearly ask, they just don't because the writers need to prolong the story somehow.
The chemistry between the leads is good and is worth the watch, but the story can hold it back at points. Thats why i'm rating the plot 7 and the rewatch value 5, because while its very well produced, i can't ever imagine someone going through this again.
I already knew that it wouldn't be a happy ending, but I wasn't expecting it to have such a non-ending as it did. Like really? thats how you're going to make use of the final moments of the show?