Old Case Password: the Seventh Suspect

When senior detective Lin Shen was investigating a cold case ten years ago, he found that all the evidence pointed to seven seemingly unrelated suspects. When he investigated in depth, he found that these people were related to a fire ten years ago. As the investigation deepened, Lin Shen gradually discovered that there was a huge conspiracy hidden behind this case, and he himself was involved in it. On the edge between truth and lies, Lin Shen must find the real murderer while protecting himself and those around him.