That Demon Within (2014 Film)
That Demon Within (Chinese: 魔警; pinyin: Mo jing) is a 2014 Hong Kong action-crime film directed and written by Dante Lam, and produced by Philip Kwok. The movie features cinematography by Kenny Tse and has a running time of 112 minutes.

Cast
The principal cast includes Daniel Wu as Dave Wong, Nick Cheung as Hon Kong, Christie Chen as Liz Kwok, Andy On as Ben Chan, Liu Kai-Chi as Broker, Dominic Lam as Inspector, alongside Patrick Keung.
Release and Festival Screenings
The film held its world premiere on February 8, 2014, at the 64th Berlin International Film Festival within the Panorama section. It was subsequently released in theaters on April 18, 2014, in Cantonese. Following its release, the film screened at several international events, including the Udine Far East Film Festival, the Asian Film Festival of Dallas, the Puchon International Fantastic Film Festival, the Fantasia Film Festival, the Sitges Film Festival, and the Brussels International Fantastic Film Festival.