That night, thief Lao Li (Fan Wei) entered a dilapidated residential building to steal, but unexpectedly witnessed a murder: a mysterious woman (Zhu Zhu) was killed. Just as Lao Li was desperately trying to subdue the murderer Yan Zheng (Zhang Songwen), the delivery man Ma Mingliang (Dou Xiao) suddenly appeared in the room inexplicably. The three of them were confused and had no idea of each other's identity. The constantly reversing plot is about to reveal the truth...