I just watch it considering the high ratings but I didn't like it. It got really bad half way through plot was horrible nothing make logical sense and the script was bad. Finish it with a lot of fast forwarding. I think the rating these days are given by some 15 years old kiddos that call everything they watch a master piece.
Personally I think this deserve 9 or 9.1 rating by MDL standard overall
I think these days rating doesn't mean anything. Almost every K-Drama I came across this year had a rating of more than 8 and I end up disliking most of those.
identity of ML?