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The drama's biggest problem is that it's overly ambitious with its concept. It wrote itself in a corner that was impossible to get out from. Which resulted in making the whole thing a convoluted mess. Right from the beginning within 2 episodes, you can tell this had a really poor world building, it didn't even care, shamelessly! The whole thing was unbelievable edgy especially the antagonist, he was the definition of edge lord. Let's just hope that we do NOT get a second season of this mess. Needless to say the drama isn't recommended. There are infinitely better thriller/supernatural Korean dramas out there.

I like how they put the story together. There's no unnecessary details of supporting characters. There's always cliffhangers to keep me interested for the next episode. The leading man and the villains are great actors. The special effects are amazing for a kdrama. I just think that the ending left a lot of questions that may hint for a second season.

Another strong performance by Joo Ji Hoon and the villain. Despite some missing detail here and there and odd part of the clown, it is a good drama. You will want to watch it from one to another episode uninterrupted.

The 2 female players are not too convincing in building up the character but they are just nice fit into the story.

Must watch for you who is looking for a good K action drama.