I'm afraid I am too old for this show, if I had watched it as a teenager, I might have enjoyed it more.

The show can be divided into two parts - one before the viewers find out who God is, and the aftermath. The 1st part could keep up interest, but then it became quite boring. Plot twists could have been exciting in a balanced amount, but here there were too many, instead of making the story interesting they made it impossible to take it seriously.

Here are the bits I find worthy of criticism:
1./ In youth action series it's natural that teenagers are unrealistically tough and in the end they save the day instead of all the incapable adults. But from the teacher's perspective (Mr. Wanpadej) it's incredibly irresponsible to form a group like Blacklist, when he already knows how serious problems the school has, and how dangerous it is to dive into it, putting students lives at risk on this level is too unrealistic and it also made Mr. Wanpadej not loveable, I couldn't cheer for him the same way I do with a character who is relatable for me. The students themselves came to the conclusion that they'd been used, and Mr. Wanpadej doesn't deny it in the end, sooo....
2./ I didn't expect this much agression and blood, even among the students, many times unnecessarily. Blacklist was supposed to be the group of the good guys, but sometimes they themselves became bullies for the "greater good", that's not a good message. An average school with mostly normal kids and teachers and only some misfits would have been more credible, here the school was full of psycho type criminals, students and teachers alike.
3./ Ms Jinmanee - a twist that was too much, without basis and unrealistic again - a woman who is raped in her teen years becoming a sexual abuser towards girls who are just like she was? Really? In the end, it turns out that she abused Traffic's sister, kept her a sexual slave at her home, she attempted killing another student (Viking), then she almost did the same to Melon - and what's her destiny in the end? Wanpadej and the girl students go like "Oh, we all make mistakes, please, turn back to being the teacher we loved (even though now we know it was just a disguise), we love you..." - WTF? The woman is a perverted psychopath, not a single bit better than the maffia principal, she shouldn't have been allowed to just move away, she should have been locked up for life, maybe not in prison but a psych ward. (None of her victims turned to the police in the end? How???)
4./ We didn't see much of the kids home lives - how could they do all the Blacklist activity after school time? None of them had parents who treated them like the actual kids they're?
Etc., etc.

On the positive side, the actors are clearly talented, their romantic bits were sweet, and they played well with what they've got - it's not the first time I write this in a review, the more thai series I watch, the more time I have the impression that the actors could do much better if it weren't for all the immature/just plainly bad scripts. The basic ideas of the stories are usually good (that's why I start to watch the shows), but how they are built up in the end is not that pro. Dramaturgy expert teachers wanted!!! :P