This show is one of my absolute favourites. The acting by both Park Hae Jin and Kim Go Eun is brilliant. They justified their characters brilliantly. Lee Sung Kyung potrayed her role with perfection as well. Overall, the casting for this drama is perfect. As for the issues dealt in this story, they are dealt with sensitivity. The psyche of a person and how they would deal with different circumstances have been shown beautifully in the show. Everything about this show is brilliant but overall it is a 9.5 because of its ending. I wished a happy ending for them both but there was no confirmation.