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A story that revolves around a young man's uncompleted revenge. Zhang Ying Xiong's father died after he was forced out of his home by Lu Zhi Qiang. Constantly wavering due to his gentle nature, Zhang Ying Xiong sets out for revenge and forges an unusual relationship with his enemy's daughter.

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.