Kim Jee-woon made seven cuts totaling 80 to 90 seconds in order to receive a Korean over 18 restricted rating. Cuts were made to a scene of body parts being eaten by a dog and humans, and a human body being mutilated. Before the censorship, the Korean censors twice gave it a rating that would have prevented a video and mainstream theatrical release.
The German ratings board FSK denied the uncut film its highest rating "Not under 18". Approximately 11 minutes were cut from the film to achieve this rating after all. For the release of the uncut version, the film was approved by an independent legal committee (because the legal committee of SPIO denied an approval).
In the end, the background music played is different in both the Korean and International versions. While in the Korean cut, the BGM that plays is emphasized and said to be forming the film's definite ending. In the International cut, the BGM is less emphasized and instead, the hero's crying voice is heard, ending the film with focus on the character.