Mu Xia is a talented locksmith. While dealing with a strange murder case within a locked room, Qin Zuo Man inadvertently discovers that Mu Xia is the new security consultant hired by the police academy. As more locked room cases arise, the simple-minded Qin Zuo Man, the monotonous Mu Xia and celebrity cop Tan You join hands to form an investigative team that seeks to uncover the truth through every door.
Four men and women are trapped together. To escape, they have to find something in common with each other. The worst escape game begins!
Twelve boys and girls gather at an abandoned hospital to die for various different reasons. There, they find the body of a dead boy. The twelve boys and girl attempt to find the person who killed the boy. During their search, the reasons why they want to die are revealed.