Why does it keep getting boring?

This drama keeps getting boring. Na Young scene in the hospital was the funniest thing in this episode, other than that, I am disappointed.

Now?!

I was surprised with Seo hye joo's resign.. like really how can she do that in such a situation?!
I understand that she's really tired, she loved him always and he never looked at her like a woman but at least she should wait a little bit more...