In "Signal" Kim Hye Soo died.
On the 7th episode of tvN Friday/Saturday drama "Signal" (script Kim Eun Hee, director Kim Won Suk) broadcast on Feb. 6th, Lee Jae Han (played by Jo Jin Woong) of the past quietly called out Cha Soo Hyun (played by Kim Hye Soo).
Afterwards, he was called in to be tasked on a very important call. He wanted to find a blue necklace that was associated with the large scale grand larceny case.
Lee Jae Han said to Cha Soo Hyun, "This is a very secretive investigation that just you and I are doing." Cha Soo Hyun who had a crush on him smiled happily.
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.