Through a series of observations and deductions, it was revealed that Xiong Qingkun was actually an actor rather than a detective. Firstly, Xiong Qingkun did not introduce himself as a detective during self-introductions, unlike others. Secondly, he barely interacted during the performance, speaking only three lines—all directed at fellow actors, not as a detective. Zeng Shuai's remarks implied that Xiong Qingkun, like the other actors, was there for the meeting. Xiong Qingkun violated detective rules by entering the corridor, indicating he was not bound by the detective role. During alibi investigations, the dialogue of other actors subtly concealed that Xiong Qingkun was also a suspect. Zeng Shuai's concluding remarks hinted at the limited number of suspects, suggesting that if a detective were secretly a suspect, the chances of identifying the culprit would decrease. Xiong Qingkun's unawareness of surveillance cameras also explained his audacity to "commit murder" in the office. Finally, when the author filled out the answer sheet in the activity room, Xiong Qingkun was absent, further confirming he was not the detective.