City on Fire (1987)

City on Fire (1987) follows undercover cop Ko Chow as he infiltrates a ruthless gang of jewel thieves while juggling pressure from his boss, suspicion from fellow officers, and turmoil in his personal life. Ringo Lam’s gritty Hong Kong crime thriller blends tense undercover drama with bursts of violent action, earning praise for Chow Yun-fat’s charismatic performance. A classic of the 'heroic bloodshed' genre, it's highly regarded for its realism and influence on later crime films.