Mister Leung serves Reileen Kawahara as her personal enforcer and hitman. He believes that those who use Cortical Stacks to achieve immortality are divine, and devotes himself to further their cause. Mister Leung has a technology that allows him to erase his presence from all forms of electronic surveillance, leading to him being dubbed the "Ghostwalker."
(Source: altered-carbon.fandom.com)
