- Severe
- The movie includes some emotionally intense moments throughout, particularly the final act.
- The intense violence and many deaths throughout are frightening.
- The deaths of several main characters is intense.
- The intense sequences in the film are heightened by a gripping soundtrack, quick pacing and brilliant sound design, giving rise to a sense of sustained threat and danger.
- Gong Yoo's character dies at the end of the film. This is an extremely upsetting, sad, emotional and heartbreaking scene. It can cause a lot of viewers to cry. It can also be very uncomfortable and hard to watch. This is definitely by far the most saddest scene in the entire movie.