First and foremost is definitely the OST. Man, it can bring you to dreamland, listening to the main theme. It always appears at the right scene. I put my foot down and affirm that although I have not watched that many kdaramas and do not know the language, but this OST was one of the best I have come across.

The overall plot was good. Ji Sung nailed every portrayal as I sobbed for every scene that had the personalities leaving him and Ri Jin. Though they shared the same body and face but Ji Sung's awesome acting had me looking at every personality individually.

Acting - Main to the supporting actors did really well. the relationships between every character were also beautifully done.

If you're a new kdrama fan like me, this is one of those dramas you must watch. it has all the elements drama, comedy, romance all well balanced and aptly placed in every scene.