City on Fire

Lung foo fung wan is a movie starring Chow Yun-Fat, Yueh Sun, and Danny Lee. An undercover cop infiltrates a gang of thieves who plan to rob a jewelry store.
Ko Chow is an undercover cop who is under pressure from all sides. His boss, Inspector Lau, wants him to infiltrate a gang of ruthless jewel thieves; his girlfriend wants him to commit to marriage or she will leave Hong Kong with another lover; and he is being pursued by other cops who are unaware that he is a colleague. Chow would rather quit the force, feeling guilty about betraying gang members who have become his friends.