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- Movie: Perfect Number (English title) / Suspect X (literal title)
- Revised romanization: Yonguija X
- Hangul: 용의자X
- 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.
- Genre: Mystery
- Distributor: CJ Entertainment
- Language: Korean
- Country: South Korea
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.
- Movie is based on mystery writer Keigo Higashino's 2005 novel "Yogisha X no Kenshin" ("The Devotion of Suspect X")
- Early working Korean title was "Wonjeonhan Sarang" (literally "Perfect Love"), then changed to Yonguija X (literally "Suspect X").
- Filming began December 10, 2011 and finished April 10, 2012. A party was held on April 10th at a restaurant in Nonhyeon-dong, Gangnam, Seoul to celebrate the completion of the movie. The party also celebrated lead actress Lee Yo-Won's birthday which was on April 9th.
- Related titles:
|Ryoo Seung-Bum||Lee Yo-Won||Cho Jin-Woong||Kim Yoon-Sung|
Additional Cast Members:
- Kim Bo-Ra - Yoon-A
- Lee Suk-Joon - Tae-Woo
- Lim Sung-Min - Jung-Sook
- Kwak Min-Ho - Chul-Min
- Kwon Hae-Hyo - Team Leader
- Nam Moon-Chul - Section Chief
- Kim Joo-Ryung - Lady
- Kim Ah-Ron - girl
- Myung Gye-Nam - motel owner
- Song Young-Chang - lie detector operator
- Chae Young-In - diving master
- Lee Hwang-Ui - homeless man 1
- Park Jung-Pyo - emergency room doctor
- Baek Seung-Do - Suk-Go's classmate 1
- 2012 (17th) Busan International Film Festival - October 4-13, 2012 - Korean Cinema Today - Panorama *World Premiere
- 2013 (8th) Korean Film Festival In Paris - October 30-November 6, 2013 - Landscape