The storyline was not new but I personally still liked it. But the finale? I don't think it was well presented. It left me with a "that's it??" (on the negative side).

The problem with this drama is the plot holes:

-Who was Denis truly?
-How/why did Dongbaek fall in love with the director?
-What happens with Denis after the time skip?
-Does the director recover his memory?

I saw a post where it explained everything about the manhwa and it was so much better than the series finale. It explained everything very well so, if you are not watching because you specially like the actors, I recomend to directly read the manhwa.