With the background of security volunteers, the film will lead the audience into the life of old Beijingers and get a glimpse of the living conditions of such a group of "mysterious" people in the city of Beijing.
| Actor | Role |
|---|---|
 Du XiaofanMa Haojie | Ma Haojie |
 Yun GeXu Yunfang | Xu Yunfang |
 Tong YangZhuang Qianqian | Zhuang Qianqian |
| WWu JuejinSister Lo | Sister Lo |
| GGao Yu-LinLao Ma | Lao Ma |
 Chen XingyuHua Ji | Hua Ji |