That night, the thief Lao Li (played by Fan Wei) entered a dilapidated residential building to steal. Unexpectedly, he witnessed a murder case: a mysterious woman (played by Zhu Zhu) was killed mysteriously. Just as Lao Li tried his best to subdue the murderer Yan Zheng(played by Zhang Songwen), delivery boy Ma Mingliang (played by Dou Xiao) suddenly and inexplicably appeared in this room.