The film revolves around Xu Zhen (played by Henry Mai) who wakes up from a coma and finds that Lin Yina (played by Xu Dongdong) and others have been imprisoned in the same iron box. Everyone is completely confused as to why they were caught here. A group of people with doubts not only have to fight hard against the beasts in the wilderness jungle facing various crises and threats from strange beasts, but also have to desperately seek ways to leave. In the process of escaping, people continue to die in the bloody mouths of the beasts.