Glass Tears (2001)

A street-kid, a retired policeman from Mainland China, a dysfunctional family, drugs, the triad - and a missing girl. This is a tale of - well, growing up. The story starts when Wu, a lonely retired policeman, comes to the busy Hong Kong island to search for his missing granddaughter, Ah Cho. For the purpose of his search, Wu encounters P, a street-kid who initially rebuffs Wu just like any 16 year-old would rebels against the older generation. Unfortunately, there is no escape from the apparently omnipresent Wu. It takes a few adventitious incidents for P to soften up. P's boyfriend, Tofu, joins in their search but also brings many unwanted incidents, such as the triad and drugs.