I really like realistic animation films so I really wanted to like this movie but it is just not really worth your time.
The movie's story is about two boys and their experience with bullying during their middle school days. The movie starts from the present when they are adults and uses flashbacks tell the story switching back and forth to break up the film into segments. The movie tackles hard real life issues like bullying in schools and system of inequalities and favoritism in the Korean society.
However the problem with the movie is that it is very derivative of better films like "Friend" and does not present anything new enough to stand out on it's own. The only unique aspect of the movie is the fact that it's an animation but it is clear that the reason this movie is an animation is because of costs. The animation quality is poor and what's worse is the poor voice recording in the film. The sound would often clip causing a lot of distortion in dialogue because they use such poor equipment to record the voice overs. Overall it does not do enough to impress in either the visuals or story and personally I would not recommend watching this film.