I may be a bit biased because I really loved it, to the point that I asked myself if this drama was just made for me!!!!!! Jokes a part I think this drama is really well made, to the point that even who dislike it has to admit it, because in my opinion there's really nothing to not like here, but I know that not everyone could like it, opinions and preferences are different for everyone and this drama is not an easy walk. The story, the major plot is the journey the characters has to go through to find themselves, then there's the thriller side and of course they intertwine as puzzle's pieces.
The characters are deeply scarred and they live their lives as aftermath of that, they become addicted to the behavior they started having because of their own traumas, misunderstandings and mistakes. They're judged for their surface and marked as what they're not. With the encounter of the three leads their lives start to change and their journey becomes even more tortuous, because sometimes getting better it's harder than staying still, they have to face not only their past but them selves too. It goes deep into their fears, insecurities, secrets and scaring moments of their lives and you can see how they're struggling to come out, you don't understand them until you get to know them and feel their pain too, I think it makes people think about lots of things, as struggling with their problems, with their past, with mental illness, mental disorders , judging..
The cast was amazing, their acting skills are amazing, not only the leads but all the cast, but yeah I found the leads out of this world, I fell in love with SYJ as soon as I heard her voice and when I saw her I was astonished, the way she portrayed KMY was perfect, every little gesture, I think her character is really charismatic, even if she appears as "crazy" it takes a very little time to understand that it's not all as it appears. SYJ expressed her emotions really well, making you questioning everything you just believed KMY was and wanting to get to know her better. KSH was really amazing too, he looked like a puppy in the drama, a worn out puppy, exhausted and tired of what life was serving him, MGT was locked up to a life he thought he had to do, in a behavior he thought he had to have, I think his journey was the most difficult one. Just watching him you could understand the pain. OJS was special, portraying MST he showed us the problems and the difficulties someone who suffer of autism has, he was really innocent and in his innocence he shows us so much maturity and truth about life, he deeply moved me, he did a really good job.
It's not only the story and the cast that made IOTNBO an amazing drama, but also the visual and the music, (with visual I mean directing, scenography, costumes etc..). The visual was beyond perfection and the music too, when I was watching it I was really captivated by how beautiful it was on screen and the music was perfectly put in it, the music too expressed the moments really well, as soon you heard the notes you understand, you start feeling.
I liked the fairy tale way to narrate the story and I liked the fairy tales too (I brought two of them!), you heard the stories and then see how they are reflected in their life, and also in real life, I think this is one of the reason why I liked this drama so much, in some of them even if not in the same way I reflected my self.
The thriller plot is great too, but being an healing drama you give more attention to other things but as every thriller you want to find out what happened, you want to know why MST is so traumatized about "nabi" the so scaring butterflies.