During the first few episodes, characters and their motivation was established really well, so I was really excited going into this series. I thought we were going to dive deeper into what connects these two heartbroken teenagers in the weird relationship they have begun. Instead, just as we start to see how it starts to affect them, the author started introducing more and more characters, and there wasn't just enough time if we wanted to have a closer look at any of them. Moreover, some of them were really one dimensional and tacky like "I love having sex" guy or the "my one thing in life is being kawaii" girl. Introduction of the characters changes mood from psychological portraits, to overcomplicated plot about everyone using emotionally everyone in hard to understand and completely unmotivated way.
I felt like the way how the internal fights of characters were shown was also very cheap. There were many scenes when the main character was listening to her "evil self", that was her with red filter all over. Also, the evil speeches were mostly all the same, and if you really listened to the words most of them were basically about nothing in particular. They were there just to sound edgy and dark.
Overall, with a heavy heart, I dropped this drama after the 8th episode.