Vengeance(2010)

In a Hong Kong hospital, a French woman lies in critical condition after a gangland hit that killed her Chinese husband and two small children. Her father Costello arrives from France and is immediately warned by police not to get involved, even as his daughter wordlessly pleads for his help. A stranger in a strange land and plagued by a failing memory, Costello sits stunned in his hotel room, scrawling the word "vengeance" over the bloody crime scene photos of his daughter's family. He soon crosses paths with three professional killers who work for the crass and flamboyant mob boss Fung, and asks them to help avenge his family. But as the men get to know their new client, they learn that his past may not be as innocent as they had assumed. As Costello's memory problems worsen, the question becomes: what is the meaning of vengeance when you no longer remember either those who have wronged you or those you have lost?