It was a slow-burn revenge story. The plot is excellent; it's thrilling and mysterious. I have nothing else to add about this other than that! It can be prolonged in some parts, but I was shocked at the plot twists and turns. It's filmed well, and it shows the cruelty behind the issues of bullying in Korea. Some might say that it's "too much" or "unrealistic," but it's ordinary for such severe bullying to occur in Korea. It's heartbreaking, but that's the reality.

Moreover, this is a thriller, but there were scant thrills throughout most of it. The plot's central concept was intriguing: activating self-destruction mechanisms, lighting the fuse, and stepping back. It offers numerous opportunities for tension-building, but the overall production didn't make the most of them. Overall, it's an okay watch.