I really loved it because the main actors were superb! They both behaved like adults unlike most c dramas where adults behave like teenagers most of the time! Here the situations were very much real and their reactions too. Just minus 1 point for uninteresting secondary couple. Just skip their scenes!
If you like mature drama with ML and FL having a really healthy balanced relationship who actually take time for each other and clear any misunderstanding they might have the very next moment it happens, then here is the show you are looking for!

Music was awesome too! Especially the starting song!

9/10 from me! Highly recommended!