This mini-series is short yet impactful. The storyline is repetitive as if it's trying to emphasize a point. Although, I admit I've been lost after watching it as if I forget everything that I watched as well. (Same as how they forget their missing classmate at the end of every other episode)

Okay so the plot is like, a creepy substitute teacher came to the school and tries to tempt students with a power that will allow them to get away from what they fear the most. There's kind of a trial period but as they get greedy for more, they have to sign a contract not fully thinking about possible consequences. It only ends with them being trapped on a mirror full of darkness and being forgotten by everyone. This has been repeating 6x on the drama and the only differences are the students have different fears to get away from thus different solutions/scenarios as well with the same pattern.

The casts were really good and the creepy teacher gives off that vibe that you can trust him but his smile is also meaningful enough for you to see that behind those smile is a hidden motive. If there's something I didn't really grasp the character, it was Kim SoHyun. Well, she did great in terms of acting but I didn't get what the drama is trying to achieve using her character. It just confuses me (or maybe I'm just too slow, I'm not sure myself.)

I mainly watched this because of Kim SoHyun and if you really like her acting she's still superb in this mini-series although the plot can be a bit disappointing. This isn't a bad drama after all you can watch it in one sitting just like how you watch a movie. There's also a lot of good takeaways like how greed can end badly for you. And how nightmares are there not to harm you but to heal you.