Personally, the plot wasn't very interesting to me (and felt a bit slow paced), but I kept watching 'cause the actors did an AMAZING job and the main leads had lots of chemistry.
From the first episode, I had the impression that the drama would contain more comedic scenes (sadly not much-would have been cool to play with the interpretation of luck more literally), however they had loads of sweet moments and most importantly the ML wasn't an irrational jerk. For once, I could actually stand the main love interest while pitying the second lead rather than despising him.