In "Signal" Kim Hye Soo started to think back to the Hong Won Dong incident and made a testimony.
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 unresolved murder mystery team started to look into the Hong Won Dong murder incident.
Cha Soo Hyun had almost been the third victim of the Hong Won Dong murder mystery but barely survived.
Lee Jae Han (played by Jo Jin Woong) rescued her and she was able to come to the police station but she looked like she was out of it. Jae Han said, "The person who kidnapped you has already killed two other people. To catch him, we need your memory" and urged her to think of the past.
Soo Hyun said, "There was a sound. A sound of water dropping. It sounded like a young man's voice. And his hands were thin and cold. He said he would come back. There was a cold gust and I thought I would die if I didn't leave. So I got up and started looking for the door."
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.