- HD 1080
- Runtime: 105m.
- Status: Released
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- Languages: ko
- Country: South Korea
- Director: Yoon Jae-goo
- Stars: Cha Seung-won, Song Yun-ah, Ryu Seung-ryong, Park Won-sang, Oh Jung-se
- keywords: detective, suspicion of murder
- Production_studio: JK Film, CJ Entertainment
- The Secret is featured in the top rankings of 2009
- #40 in Top Crime Movies of 2009
- #58 in Top Thriller Movies of 2009
A detective suspects that his wife murdered a gangster's brother. As he tries to misdirect the police and the bloodthirsty gangster while independently investigating his wife, terrible secrets slowly begin to surface.