There have been several similar transition to afterlife stories. I liked the formula of this drama - they have a case of the week that our team has to solve and bring closure to the deceased. That kept the delivery each episode interesting. The 'rules of engagement' (ie rules governing how they operate together eg safe zone, Dae Ri jumping into a human host for 10 minutes at a time, etc) were established early on and stayed consistent, unlike some dramas that bent the rules just to fit the plot or to create dramatic tension or because they didn't know how else to conclude the drama.

In terms of negatives, perhaps the weakest point was the romance between the main leads. There was no chemistry whatsoever and they looked awkward together especially when they had to call each other cutesy names, or kiss or hug. The second couple had far better chemistry (at least no awkwardness) but I'd rather the drama just focus on the cases! Second, the last few episodes were especially draggy when they were trying to develop the romantic relationships rather than resolving things. Third, the OST was boring - they had one song and used that to death for everything - sad, happy, dramatic, etc. I'm not expecting a highly listenable soundtrack like CLOY or DOTS, but we're basically going back to the early 90s with Autumn in My Heart and their one song-one-hit-repetitive-wonders.

In contrast, the chemistry between the four 'team members' was enjoyable to watch. I enjoyed how they worked together with a mix of humour, teamwork, and goodwill to overcome the villians. Overall, it was entertaining and I enjoyed watching it but I wouldn't call it the best drama of the year or even of the genre, not even close.