Perfect Number is a 2012 South Korean mystery-drama film directed by Bang Eun-jin. Adapted from Keigo Higashino's novel The Devotion of Suspect X, it centers around a mild-mannered mathematics teacher who plans the perfect alibi for the woman he secretly loves when she unexpectedly murders her abusive ex-husband. Cho Jin-woong received a Best Supporting Actor nomination at the 49th Baeksang Arts Awards in 2013.

Kwon Hae-hyo is a South Korean actor and activist. In addition to his acting career, he is also known for his activism. Kwon has been involved with a number of organizations advocating for political and social justice causes, including the Unite Our People Movement Headquarters, the Abolish the Family Registry and Create Family Equality Organization, the Cultural Alliance for Peace at Daechuri, and the Minkahyup Human Rights Group.