In "Signal" Kim Hye Soo underwent hypnosis investigation in order to find the serial murderer.
On the 10th episode of tvN Friday/Saturday drama "Signal" (script Kim Eun Hee, director Kim Won Suk) broadcast on Feb. 20th, the long term serial murder team investigated the Hong Won Dong murder incident.
The detective Cha Soo Hyun (played by Kim Hye Soo) was briefing about the Hong Won Dong incident and said, "There's a person that's the only one who ran into the culprit" and said that she would undergo hypnosis.
She then talked to Park Hye Young (played by Lee Je Hoon) who tried to stop her, "I don't know his face but I might be able to find out the house. There's evidence somewhere in my memory."
In the end, Cha Soo Hyun used hypnosis to think back to the past.
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.
