Movie: Perfect Number (English title) / Suspect X (literal title)
Revised romanization: Yonguija X
Director: Pang Eun-Jin
Writer: Keigo Higashino (novel), Kim Tae-Yoon, Lee Kong-Joo, Lee Jung-Hwa
Producer: Lee Suk-Won, Lim Sang-Jin, Shin Yang-Joong
Cinematographer: Choi Chan-Min
World Premiere: October 7, 2012 (Busan International Film Festival)
Release Date: October 18, 2012
Runtime: 119 min.
Distributor: CJ Entertainment
Country: South Korea
Suk-Go (Ryoo Seung-Bum) is a brilliant mathematician. His life though is largely empty. Hwa-Sun (Lee Yo-Won) is an attractive young woman on the run from her past. She lives next door to Suk-Go.
One evening, Hwa-Sun’s former boyfriend surprises her at her apartment. Hwa-Sun fled her small hometown to get away from her violent ex-boyfriend. Her boyfriend is there to get revenge. He proceeds to beat her violently. Meanwhile, Suk-Go sits alone in his apartment. He hears clearly the violent struggle taking place next door. Finally, Suk-Go decides to knock on his neighbor’s door.
Soon, Suk-Go devises an intricate plan to cover up a crime. Hwa-Sun begins to have doubts about Suk-Go and wonders if he is yet another pyscho. Suk-Go has secrets as well.