Hong Kong organized crime

Pioneered the heroic bloodshed genre with stylized depictions of triad violence and honor codes in films like 'The Killer' and 'Hard Boiled.'

Created sophisticated examinations of organized crime's moral complexity in works like 'Election,' 'Triad Election,' and 'PTU,' exploring power structures and criminality.

Directed the critically acclaimed 'Infernal Affairs' trilogy, which deeply explores the psychological warfare between triads and undercover cops in Hong Kong's criminal underworld.