If Liu Zhi is the murderer, then his motive must be related to Sun Qianqian.
Even when Liu Zhi murdered, Sun Qianqian was very likely at the scene.
After half an hour.
Interrogation Room One.
"Captain Chen, I have said everything I know."
Liu Zhi said with a sad face: "In the past two years, Junjie has offended many people by playing in nightclubs. I can''t remember many of them, and I don''t even know each other."