He is one of the most celebrated screenwriters in Hong Kong and has won several prestigious awards at the Hong Kong Film Awards. Chong is known for frequently working alongside cinematographer/director Andrew Lau and writer/director Alan Mak.
Chong's best-known film as a screenwriter is Infernal Affairs, which he co-wrote alongside Alan Mak. Other films written by Chong include Infernal Affairs 2, Infernal Affairs 3, Initial D, Dance of a Dream, and Confession of Pain.
As of May 2017 filming of “Project Gutenberg", a big-budget Chinese-language action film, started. The picture is written and being directed by Chong.
In Feb 2021, Chong will write and direct a new major action movie titled Goldfinger, backed by Emperor Motion Pictures and mainland Chinese partners, with a reported budget of around $30.8 million (RMB200 million).