Integrity is a 2019 Hong Kong crime film written and directed by Alan Mak and starring Sean Lau, Nick Cheung and Karena Lam.

The captain in charge of the case, Chen Jingci, and the person who was responsible for finding witnesses, Jiang Xueer, were previously a loving couple working together in the ICAC.

The project was first announced to be in development in December 2017, with Alan Mak writing and directing, and his frequent collaborator Felix Chong serving as producer, and set to star Sean Lau, Nick Cheung and Karena Lam.

[1] On 19 March 2018, the film was promoted at the Hong Kong Filmart, where it was attended by director/writer Mak, producers Chong and Ronald Wong and cast members Lau, Cheung, Lam, Michelle Wai and Kathy Yuen.

On 11 April, a scene was filmed in a restaurant in Central, Hong Kong where Lau confronts Anita Yuen, who guest stars as a corrupt customs director.

[4] On 24 April, filming was carried out indoors with cast members Lau, Cheung, Alex Fong, Carlos Chan and Kathy Yuen, while Albert Yeung, head of Emperor Motion Pictures, also visited the set.