I said in a comment prior of the drama that everyone was saying they hoped it would be as good as the webtoon.. and I said I hoped it would be better.
As I said before, the webtoon had a cliché story but good characters, so the actors could make it or break it - since it would depend a lot on chemistry and acting.

Fortunately... they gave us so much more!

For me the best surprise was the comical parts - specially in the early episodes - they were really funny and fresh. The actors did a superb job (special praises to the main girls duo, imo) and also overall writing and directing.

The only downside compared to the webtoon was the change in Taemoo's grandfather final storyline. Originally he supported Taemoo and Hari's relationship and also defended Sunghoon from Young Seo's father (this last one was really touching). Such a shame his character lost all depth...

Nevertheless, a must watch for romcom addicts like me. A Business Proposal, you will be missed! :)