First thing first, OCN is riding on such a high because of such amazing stories and dramas, you have to give the network their due credit for not shying away with experimenting with every kind of genre.
The story is really something to think about because it shows real life problems from a different and twisted perspective, you may or may not agree with but have to admit to the ills of the world. The whole concept is masterfully tackled and there is no empty space between the story, acting and the final product. This one is for everyone to watch. Do not miss out on a gem of a drama that needs much-deserved appreciation.
As for the cast, what to say. Mind-blowing chemistry between the leads and the supporting cast, especially the ones that had to act out "possessed". From grandpa to a child, everyone was amazing at their work. The way each lead played off, off on each other's energy was commendable. Kim Dong Wook, Kim Jae Wook and Jung Eun Chae were the perfect casting and has become one of my favourite team to root for.
The story is a rollercoaster ride through and through and keeps you on your toes until the very end. Usually, such stories are difficult to express due to fear of making it look draggy, but not here. The writers did such a fantastic job jotting down each character and situation that there would be almost no loop-holes to be found.
Such a perfect drama can only come from such a fine network.