The drama portrages the NSA badly, they are threatening and scary. second it adresses how they frame the student activists inluding the one with the glasses who's an activist btw. I do think we should take into consideration all the criticism , about haein character being a spy as well but his character is not an activist. he will only be thought as such by youngro(jisoo's character) and we still don't know how the events are going to unflold. the drama is really fast-paced btw , each episode there is a new reveal and it still like all epidodes adance quickly.
MY TAKE: the criticism is warranted but in many ways reaching. the drama does not actually go against the history and it's distorted to claim it as such. the only addition is haein being a spy and like i said we don't know how his character is going to act or why he's being chased. also this is just for the sake of having a discussion.