In "Signal" Lee Je Hoon told Jo Jin Woong to "catch the real culprit."
On the episode of tvN Friday/Saturday drama "Signal" (script Kim Eun Hee, director Kim Won Suk) broadcast on Feb. 6th, Eun Ji (played by Park Shi Eun) dies and Jae Han (played by Jo Jin Woong) was quite distraught. With that, Hye Young (played by Lee Je Hoon) said that they should catch the real culprit.
On this day, Hye Young said, "This incident should have been left unresolved. I touched this in the wrong way." With that, Jae Han was distraught and said to Jae Han, "Catch the real culprit. We ruined this and therefore, we have to turn it around."
Jae Han said, "If you want to find the real culprit, you can find that now." With these words, Hye Young felt better.
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.