In "Signal" Kim Hye Soo learned that Lee Je Hoon and Jo Jin Woong were using walkie talkies together.
On the 14th episode of tvN Friday/Saturday drama "Signal" (script Kim Eun Hee, director Kim Won Suk) broadcast on Mar. 5th, the culprit of the incident of In Joo was found not to be the brother of Park Hye Young (played by Lee Je Hoon) but Jang Tae Jin. In addition, Hye Young said to Cha Soo Hyun (played by Kim Hye Soo) that he was using his walkie talkie with Lee Jae Han (played by Jo Jin Woong).
On this day, Hye Young found the victim of the In Joo high school incident, Kang Hye Seung. Kang Hye Seung told Hye Young about the identity of the culprit. Nonetheless, Hye Seung said that she was afraid fo the victim blaming that would happen and with that, she was not going to go ahead and say who the real culprit is.
Hye Young was upset that his brother had been framed and died yet the real culprit was still in In Joo and having a great life. Through the walkie talkie, he said that he was going to save Jae Han and catch the real culprit as well.
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.
