Twelve-year-old Hai Wa sends a secret letter containing Japanese military information to the Eight Route Army during the anti-Japanese war.
| Actor | Role |
|---|---|
 Cai YuanyuanWa Hai | Wa Hai |
 Anan CaiWá Gǒu | Wá Gǒu |
 Shu Shifather | father |
 Jiang RuiLianchang Zhang | Lianchang Zhang |
 Baoluo LiFarmer | Farmer |
 Fei LiuZhang | Zhang |
| LLi MaNiu Gui | Niu Gui |
 Yong LiWang Xiao | Wang Xiao |
 Feng XiaoLiu Xiao | Liu Xiao |
 Boxun ZhouCommander | Commander |
 Cheng ZhiZui Wai | Zui Wai |
 Yu MingdeGoujia Hei | Goujia Hei |
 Lan WangNot listed | Not listed |
 Cao DuoMilitia squad leader | Militia squad leader |
 Gongmin YangMilitia | Militia |