There are differences but the similarity i find is the concept of ghost and how these ghost are walking around their family members who are alive. Also there are side stories in both that is, the stories of some ghost, how did they die, why they haven't reincarnated etc. and our main character helping them out .
Also i find out that both main characters are given specific missions to complete , if failed they will reincarnate .
Both dramas basically shows life after death situations.