In "Signal" Kim Hye Soo realized that the past had changed.
On the last episode of tvN Friday/Saturday drama "Signal" (script Kim Eun Hee, director Kim Won Suk) broadcast on Feb. 26th, Lee Je Hoon (played by Park Hye Young) was shot and when dying, said, "I received a walkie talkie at 11:30PM"
Meanwhile, "Signal" was about two detectives - one from the past and one from the present who communicate through walkie talkies to resolve long-time unresolved cases.
As the follow up to "Signal" there will be airing "Memory" which is a drama about a law firm lawyer who is diagnosed with Alzheimer's who is living at the height of his life. As it's expected to talk about the value of life and family values, it features Kim Ji Soo, Lee Sung Min, Park Jin Hee and Joon Ho.
Lee Je Hoon suffered from severe injuries and said, "You need to save the policemen." He said this repeatedly and worried about Jo Jin Woong when he went to Sun Il Mental Hospital. Before dying, Lee Je Hoon was rushed to the emergency ward and was able to barely survive. He said, "It changed" and realized that the future had changed.
Lee Je Hoon said to Kim Hye Soo (played by Cha Soo Hyun), "The walkie talkie changed. I said before not to go to Sunil Mental Hospital. This time, the person that talked about Sunil Hospital isn't me. The walkie talkies changed so the past could've changed too.
As the situation got worse for Lee Je Hoon, he went back and forth between life.