One of the highest grossing Korean horror films in history, earning a total of 1,636,149 admissions.
The Korean title, "gosa", means "exam" in Korean. It refers to the important midterm exam as well as the final exam that Korean high school students take. The "sa" is a play on of the homophone "sa", which also sounds like the word "death" in Chinese.
The directorial debut of Chang, a former MV director.
Unlike other summers, Death Bell was the only horror film released during the summer of 2008, just before the film Loner was released in autumn of 2008.
Actor Kim Bum was given brief DJ-ing lessons by an actual DJ prior to filming the nightclub scene, though because the entire scene was already going to be filled with background music, he mostly made relatively simple hand movements across the discs.