In "Signal" Kim Hye Soo tried to go under hypnosis.
On the 9th episode of tvN Friday/Saturday drama "Signal" (script Kim Eun Hee, director Kim Won Suk) broadcast on Feb. 19th, Cha Soo Hyun (played by Kim Hye Soo) confessed that she had been a victim of the Hong Wong Dong murder incident.
On this day, Cha Soo Hyun wanted to find evidence to catch the serial killer and underwent hypnosis. Through hypnosis, Cha Soo Hyun said, "The rotten smell. I just ran but I couldn't see well" and explained the situation then.
Afterwards, she said, "But I hit something." Afterwards, she started to shake and her hypnosis ended up as a failure.
At this, Cha Soo Hyun said, "I think I missed something. I'll do it again." But Ahn Chi Soo (played by Jung Hye Kyun) said, "This is a method that had already failure. Just focus on the ones that had already died."
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.