Where to begin?
To call this Drama "dramatic" is an understatement.
It starts of quite light and fluffy, but also fast. They seem to rush the relationship between the FL and the second ML quite a bit and then turn it into an overly dramatic star-crossed lovers theme (which we are kind of used to by cdramas up until a few years ago)--- only to completely disregard its existence for more than 2/3 of the drama?! Really??!?!
In my opinion it could have been quite interesting to see everyone (including the main couple) cope with the feelings developing between the FL and her lovers childhood friend.- but we get NOTHING. Somehow the writers forgot about every plot entanglement developed in the first 10-12 episodes and NEVER TOUCH ON THEM AGAIN! - Again: REALLY?!?!?
At points I still found myself rooting for the main couple, because the actors actually do have some great chemistry - but the plot-holes made their relationship so inconsistent that I found myself not caring at the end.

Again writers: How can you never touch on your dead best friend when falling in love with his almost fiance? How can you jump over the main leads mysterious first meeting? How is the FL suddenly nonchalant about the relationship between her father and her almost-mother-in-law, when this is the reason for her breaking up with her "great love" and also ultimately the reason for him DYING!! Again - how can you disregard the consequences of DEATH?!?!

Ultimately, I couldn't bring myself to care about any side storyline, as those characters felt bland and as inconsistent as the rest of the drama.
I would only rewatch it for the actors and for the first 10-12 episodes... but then probably would regret it and hate myself, as I can see the nicely set-up storyline take a sharp turn for plot-hole-ville.