Recently, a terrible murder occurred in the city. The exposure of a female corpse cut into 6 pieces and the murderer's impunity caused panic in society. In exchange for a vacation, Jiang Minhao (Xue Jingqiu), a researcher in the search section, took over this thorny case. He acted vigorously and joined forces with the reasoning genius Min Ruiying (Han Hye-jin), and the investigation made rapid progress. The name of the suspect Li Shenghao (Liu Chengfan) gradually surfaced. As soon as Li Shenghao was arrested, he confessed to the crime he had committed, but Jiang Minhao found that the facts were not as simple as he said. At this juncture, Jiang Minhao's daughter suddenly disappeared, and he knew that this was definitely related to Li Shenghao. Li Shenghao told Jiang Minhao that if he wanted to know the whereabouts of his daughter, he had to play a puzzle game with him-unravel the puzzle he left on the body. A bet with life as a chip began.