Rewatched it twice only few months apart, it is definitely one of the best feel good K-drama romance series.
You can enjoy the romance pretty well from the beginning.
There is no stupid misunderstandings and problems are sorted out quickly.
No yelling and opposing parents (at least for the main couple).
The FL is emotionally strong and brave woman, not a dumb crybaby.
The ML is nice and forgiving without being softie
The story is unusual and make sense almost all the time (very very rare for kdrama)
There are no big wholes in script.
The focus is on the main couple and the side characters are really supporting the story well.
There is no nerve wracking vilain (the bad guys characters are actually believable).
Awesome series!