I think a lot of the good talent in this series was underused. The writing was sloppy and superficial in trying to pull the heartstrings of the viewer. They spend much time on less important characters than focusing on the leads. The storyline is everywhere, following lesser characters instead of fleshing out the leads and giving the viewers time to get to know and care for the main leads. People disappear and reappear making the storyline choppy and frustrating. In 12 episodes this series could have been wrapped up tightly and neatly. Instead we got a lot of jerk kids whom we barely knew and didn't much care about.

The main thread of this show is the consequences of bullying. Everything that happens subsequently is the result of the students' bullying of one another. That bullying leads to revenge, which leads to disaster. It was a depressing show with little lighter moments. The stars here really are the zombies. The most frustrating part of this show is the lack of continuity. Storylines begin and then are abandoned to give other characters more air time. Those abandoned characters aren't heard from for several episodes before they come back only to disappear for longer stretches again. It was entertaining, but not well written or gripping as Train to Busan. For all the comparison that the show itself makes to the movie, this is NO Train to Busan. This series is gorier, slower, and not as well written. It leaves you feeling run down, disappointed, and sad in the end.