When friends and partners-in-crime (Jordan Chan, Simon Loui, Mark Cheng, and Yo Yo Mung) decide to leave the dangerous crime world in hopes of securing a more peaceful lifestyle, their boss insists they complete a final mission. It doesn't look unreasonably difficult upon first glance, but their plans don't go as smoothly as they had hoped. Before long, a quiet retirement looks impossible, and a violent, full-scale war between the underworld's local gangs erupts before them. Killer was directed by Chung Shi Hung and also features Ken Wong. ~ Tracie Cooper, All Movie Guide