Based on a novel "Togani" by Kong Chi-yŏng. Originally produced as a motion picture in 2011. Dolby digital 5.1 ; 2.35;1 ; Color/Dual layer. Extras: Behind the scenes: institution ; Behind the scenes: the students ; Deleted scenes with director's commentary ; Poster photo shoot ; Still gallery ; Trailer. Board of Film Censors, Singapore: M18 (Mature content). Produced by Eom Yong-hoon, Na Byung-jun ; screenplay adaptation and directed by Hwang Dong-hyuk. Gong Yoo, Jung Yu-mi. In Korean, with optional subtitles in English.