Butterfly Effect II

[The genuine version is in Jinjiang! ! ! A fire broke out in the library of Pucang University in Linyuan City. Firefighters found a charred body in the fire scene. After examination, it was found that the deceased did not die from the fire but was pierced through the liver with a sharp knife. That night, a deaf-mute young man who claimed to be the murderer came to the police station and surrendered. Unexpectedly, he took poison and committed suicide because the police were unprepared. The police officer involved was investigated, but was found by his colleagues to have died unexpectedly at home... The deaths that appeared one after another were linked to an old case. A trio from the Linyuan City Criminal Investigation Corps peeled away the fog to find the truth. (Note: Micro-group portrait, a short story of more than 30,000 words; please do not pay attention to the imaginary environment, all department settings, work processes, etc.; The names are arbitrary, and any similarities are purely coincidental; this story is purely fictitious.) Concept: a case