I've watched this title since it was on my recommendations here on MDL, and also because it had a good plot and also a good length for the episodes.
Overall it wasn't a bad drama, the pros are that the story is new and at least original (it thought it was a thriller title but turned out to be a dark/psychological drama), it's beautifully shot and also belongs to a real story, so it's pretty interesting!
The cons are the teacher, he was extremely over portrayed and also confusing...
From the 6th episodes, I've started to skip some scenes because it started to get really boring and somehow heavy.
The end left me confused, probably I've also needed to read the manga is based on understanding everything, but I'm serious by saying that I had to watch the end more than once since it seems there's a second season but actually there's nothing more after the titles...
Overall I don't give it a 7/10 ...