That Demon Within (movie, 2014)
Genres: Action, Crime, Horror
Director: Dante Lam Chiu-Yin Dante Lam ChiuYin
Cast: Daniel Wu, Nick Cheung Ka-Fai, Andy On Chi-Kit, Liu Kai-Chi, Christie Chen Daniel Wu Nick Cheung KaFai Andy On ChiKit Liu KaiChi Christie Chen
IMDb rating: 5.9 (1555 votes)
Overview: By a strange twist of fate, dutiful Hong Kong policeman Dan saves the life of the leader of a violent gang of armed robbers.  When they commit another crime, Dan is determined to put an end to their activities.  He works with the leader, whom the gang had betrayed, to engineer a plan to wreak havoc within the gang and let the gangsters kill one another.  But it becomes increasingly obvious to Dan and to his colleagues that Dan is suffering from a severe mental disorder, and Dan finds that instead of upholding the law as a righteous police officer, he has now become a fugitive wanted for murder.