Lao San, is a retired Marine veteran who lives in his world of innocence and optimism due to a brain injury. He assumes the role of a dedicated vigilante and fights people whom he considers bad.
| Actor | Role |
|---|---|
 Liu YeLao San / Wang Tao | Lao San / Wang Tao |
 Steve YooBlackie Hei Yong | Blackie Hei Yong |
 Zhang ZilinHan Xiao Hui | Han Xiao Hui |
 Vincent Chiao En-chunChief Han | Chief Han |
 Liu HailongFatty/ Er Pang | Fatty/ Er Pang |
 Xu DongmeiProfessor | Professor |
 Alan NgBin Zi | Bin Zi |
 Du YumingBrother Hui | Brother Hui |
 Zhang LuXiao Yong | Xiao Yong |
 He YongshengDirector of police | Director of police |
| ZZhan Shi-BaoDa Zhang | Da Zhang |
| LLouis Keung Kwok-WahGiant Lu | Giant Lu |
| JJiang Cheng PengBank Manager Dou | Bank Manager Dou |
| LLiu Zuo-TaoCar thief | Car thief |