In "Signal" the last piece of evidence was the electric shock machine that the last victim had been holding.
On the 4th episode of tvN Friday/Saturday drama "Signal" (script Kim Eun Hee, director Kim Won Suk) broadcast on Jan. 30th, the unresolved long term murder team worked hard to resolve the Kyeongi serial murder incident.
In 1989, the bus attendant started to suspect Lee Jin Hyung. At the place where the last victim had been hurt, the last victim had used their shock machine.
This shock machine was the gift that police officer Lee Jae Han (played by Jo Jin Woong) had given Kim Won Kyung. There on the electric machine, the victim and culprit's fingerprints and blood were on it.
Meanwhile, "Signal" is about two detectives - one from the past and one from the present who communicate through walkie talkies to resolve long-time unresolved cases.
