Films Back Room Service Yum Investigation 陰目偵信 A film by Leung Kwok-Fai Hong Kong, 2023 Credits Director Leung Kwok-Fai Script Ling Wai-Chun, Jolyon Cheung Producer Siu Kim-Chau, Tai Pak-Ho Cast Leung Yip, DeeGor Ho, Denis Kwok Language Cantonese Subtitles English Leung Kwok-Fai Director "Yum Investigation"