In Linjiang City, a prosperous yet hidden city, many "copycat murders" have occurred one after another in the past ten years. The techniques are highly similar to an unsolved "clock serial murder case" twenty years ago, but there are subtle differences, as if the murderer is "continuing" the old case in his own way.
Concept: Who is the murderer of the imitation case? What is the connection with the real culprit of the "clock case" twenty years ago? Was Lin Mo's father's "accident" a homicide? What is Gu Yan's true identity and purpose?