Everything... was so good. The ending was definitely the best part I think because it was absolutely insane. To me, the first few episodes were kind of confusing and I didn't really understand what was happening, but I think it was made to be that way because they probably wanted the characters to be mysterious in the beginning so they could tell us all of their backstories near the end and hit us with a wave of emotion. Well, good choice. Also, the plotline of this so is VERY unexpected, it talks about bullying, suicide, etc, so it's really a mix of all that, gore, thriller, monsters, and character development of absolutely amazing characters who deserve to be worshipped. The last few episodes went kind of fast, especially some parts I thought they should've lingered on more, but it's still one of the best dramas I've watched. And the plot is so good I can't even describe it.
The characters and actors/actresses were absolutely INCREDIBLE. The way they acted their characters out SO well is amazing. The love I have for some of these characters and the emotion I feel for them shows that the actors and actresses did a phenomenal job and they were a great pick for the role. My favourite characters are Hyunsu, Jaeheon, Yikyung, and Eunhyuk. And wait, we can't EVER forget one of my favourite actors, Kim Sungcheol. I NEVER knew he had this side of him when he played Eui Myeong. *Shakes head* he's absolutely insane, his acting skills are just simply so good. He can act the sweet guy like in 'Our Beloved Summer' or he can play the... wait, no spoilers, whatever character he plays in here lol. I also just watched this because of Song Kang, and thank goodness I watched it because it's definitely one of my favourite shows ever. And I mostly watch romance dramas and I've never watched something like this so it's odd that it's one of my favourites now. That shows how good it is!
Overall, it was amazing and I would recommend this to absolutely anyone.