The 12th Suspect is a full-length feature film directed by KO Myoungsung, who also directed a documentary titled Good Bye (2009) about Korean immigrants living in Japan who went to North Korea. Set in a teahouse in Myeong-dong, Seoul right after the end of the Korean War, The 12th Suspect follows the suffocating psychological showdown that takes place between a detective and the 11 suspects who find themselves caught up in a murder case. The tight narrative between the characters and the enthusiastic performances of Kim Sangkyung, Heo Sungtae, Park Sunyoung, Kim Dongyoung, and the other actors prevent the film from falling into a monotony that could potentially be caused by a limited space like a teahouse. Through symbolic spaces such as the Korean War, Myeong-dong, and Namsan, the film attempts to take a look at the dark foundation of the modern history of Korea which has been carried forth through liberation, the Korean War, and division.
一战前，德国人祖（奥斯卡·威内尔 Oskar Werner 饰）和法国人占（亨利·赛尔 Henri Serre饰）在巴黎结识。他们意趣相投，对诗歌和小说都有强烈而共同的兴趣，甚至二人为着同一个雕塑也着迷。顺理成章地，祖与占都爱上了同一个女子：聪明貌美的凯瑟琳（让娜·莫罗 Jeanne Moreau饰）。 在这样的关系中，占选择了成全温柔单纯的祖。他们一起到乡间度假，度过了美妙时光。然而一战的爆发，却让他们失去了联系，在自己国家服役期间，他们多么担心会在战场上杀死自己的好友。而祖，从不间断地给妻子凯瑟琳写信。 战争结束，祖与占再次相遇，占觉察到祖和凯瑟琳的关系很糟糕——她对婚姻以外的感情从没停止过追逐，喜欢在各种爱情关系中享受自由。占在祖家中住下，凯瑟琳毫不掩饰对占的爱，这段三角关系平衡而快乐的维系着，旁人完全看不透。当占要离去时，凯瑟琳直率锐利的性格...
