I am unsure why this show has such a low rating but to each his/her own. I really loved this series because with all the hell going on in the world, it was good to be taken away to a funny, romantic/fantasy like world to escape things. It's a bit cheesy but that's what makes it wonderful as I for one am tired of all the violent and depressing movies right now. It's good to just escape.
The main leads to a great job and the message is simply to write your own story, follow ones dreams and love and be loved. It's kind of a throw back to the K-dramas of old which is why I loved it. The supporting cast is brilliant and funny and the twists keep coming. It also provides insight into the corporate world of South Korea and the politics that go on. I wish they would have done a little more with the older sister and had her soften up a bit earlier but better late than never.
If you want to just escape and have good thoughts that make you feel good, then definitely watch this.