Over two hundred people are trapped, and everyone is suspicious of each other in fear. Gu Pingsheng is the only exception. He is a former criminal police officer who lost his partner Chen Du in a case code-named 0117 three years ago, after which he resigned and disappeared. He has no supernatural abilities, but he knows a set of interrogation logic taught to him by Chen Du: micro-expression analysis, speech pattern disassembly, and behavioral logic reconstruction. Using this method, he peels back the design logic of the rules layer by layer, saving a mother who protected her daughter with lies for two years, a female college student whose dark thoughts were implanted by the rules, and a physics teacher who took the lead in accusing him out of fear.