The drama was very captivating. Even though the story revolved around high school students, you were still invested in the characters and plot. That's one of its strengths -it never tried to make a grand story, instead it focused on a classroom and its teachers. And it did it well. Its other strength were the stories of friendship (and bromance). You couldn't help rooting for them! ^^ The students were mostly newbies, but they did very well. Their rookie status is probably what made them believable as high schoolers. Jang Nara and Daniel Choi delivered great performances, as well as the other cast members.