In the detective game at Handong Middle School, participants use reasoning to identify the perpetrator of a simulated case. In the game setting, Zeng Shuai plays the role of the "deceased", while the real culprit is hidden among the participants. The detectives first considered whether it was possible for outsiders to enter the scene during the time of the crime, but Tan Juanjuan pointed out that only association members holding student cards could enter, ruling out this possibility. Wen Rui proposed to check the surveillance footage of the long corridor to identify the perpetrator, but found that the camera was damaged before the incident and could not provide any clues. Zeng Shuai subsequently announced the end of the game and provided some reasoning tips: the culprit was one of the participants, ruling out the possibility of suicide, police being the culprit, or multiple people working together to commit the crime. He encourages detectives to independently complete detective reports and determine winners based on the reasoning process rather than speculation. The game ends with Duan Xiaolei's mysterious smile as a suspense.