In "Signal" Jo Jin Woong started to wonder why he had a walkie talkie instead of other people. With this, he had a lot of suspicions.
On the 9th episode of tvN Friday/Saturday drama "Signal" (script Kim Eun Hee, director Kim Won Suk) broadcast on Feb. 19th, Park Hye Young (played by Lee Je Hoon) started to wonder why he was the recipient of walkie talkie messages.
On this day, Park Hye Young heard from Ahn Chi Soo (played by Jung Hye Kyun) that the walkie talkie that he was carrying was the one that had been found when Lee Jae Han (played by Jo Jin Woong) went missing.
At this, Park Hye Young said, "Detective Lee Jae Han was framed for bribery and then disappeared. Someone from inside the police department. If you can find this person, then you'll be able to know why the detective disappeared" and thought of Ahn Chi Soo.
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.