It is nearly a year since I watched this, but found I hadn't written a review. That means this won't be very detailed, though.
This was one of the earlier C-dramas I watched, and I will say this is a quality production through-and-through.

Well-written script, interesting story, good acting; even if I don't remember everything, this is a drama I do remember, and might actually consider re-watching at one point (that is not many!).

What I believe made this memorable to me, are for example:
- Interesting characters and good character-development. How FL changes and matures, and ML's depth and complexity are some factors
- Not too plot-ridden/scheming acts (although there are some)
- The cast (ML and FL), and their chemistry
- A bit of frustration - but in this case it implies a well-written story
- Good mix of slice-of-life/growing up, business and romance