What I liked

The FL is so great
The storyline is new and rich
There are 3 really beautiful songs

What I didn't like
Couldn't figure out if the ML is not a good actor or if the issue is the limited character development bordering on unhealthy obsessions
There is a dismal background theme. It is quite depressing and it would be all right to be used in the actual painful memory scenes however it is liberally used throughout the drama in the main lead's interaction rendering it a constant "doom" feeling instead of a romantic one. This was actually my main issue with this show and often I had to mute the scenes. They might have realized there was an issue with it because towards the last story arc it was not used anymore.
The storyline with so much great potential felt undeveloped and at times disjunction and forced.
The FL has obvious issues in the kissing scenes and tightly closed her lips as if disgusted by it. That was weird LOL. I actually admire the dramas where the main leads don't need to obviously kiss in the lips yet are able to convey amazing chemistry and romantic feelings by closeness and tenderness.