Perfect Number

A reserved mathematics teacher uses his intellect to design a complex cover-up for his neighbor. After the woman kills her abusive former husband, the teacher intervenes to help her deceive the police and hide the crime. This South Korean mystery thriller centers on the tension between the man's calculated plan and the resulting investigation.

The film was directed by Pang Eun-jin and featured a screenplay by Kim Tae-yun, Lee Gong-ju, and Lee Jung-hwa. The cast is led by Ryoo Seung-bum as Suk-go and Lee Yo-won as Hwa-sun, supported by Cho Jin-woong in the role of Detective Min-bum. Production was handled by several companies, including CJ Entertainment, Twin Co. Ltd., K&Entertainment, and Studio K.

Released in 2012, the movie earned 10 million USD at the worldwide box office. Audience reception was generally positive, with a rating of 6.9/10 based on 2,600 votes on IMDb and 6.7/10 from 75 votes on TMDB.