This drama has its advantages and disadvantages.
Pros: interesting concept, interesting characters headed by ML and the General, great secondary characters (ghosts) and a really funny sense of humor (at times). This is currently the only drama that piques my interest and I look forward to each episode with excitement. I have real fun watching it.
Cons: The reincarnation theme (watching it I feel like I'm listening to a broken record), scenes that just have to be in every k-drama (I'm really sick of them), a villain that doesn't smell like danger or horror at all despite doing very bad things. You just don't feel the atmosphere.
But overall this drama is great fun just sometimes boring :)