Five years on from The White Storm, Hong Kong stars Sean Lau Ching-wan and Nick Cheung Ka-fai join forces once again in the forthcoming film, Integrity, which will hit China’s theaters on Feb 5 — the first day of 2019 Spring Festival.

Directed and written by Alan Mak Siu-Fai, the film is produced by Felix Chong Man-Keung and Ronald Wong, all veterans in Hong Kong cinema circles. Mak and Chong are best known for their co-directorial franchises, Infernal Affairs and Overheard.

Mak, whose father and elder brother are both police officers, says the inspiration of the film came from a cigarette smuggling case.

Thanks to a talk with some officials at Hong Kong Independent Commission Against Corruption a few years ago, he was able to expand his knowledge and shape the story of Integrity.