The Second Signal (2026 Korean Drama)

The Second Signal is the long-awaited sequel to the 2016 Korean crime thriller Signal. Criminal profiler Park Hae-young, detective Cha Soo-hyun, and missing detective Lee Jae-han are once again connected through a mysterious walkie-talkie that allows communication across time. The story follows the team as they investigate new cold cases whose clues cross different periods. Hae-young and Soo-hyun work in the present, while Jae-han continues pursuing crimes from the past. Their transmissions alter events and reveal connections between supposedly unrelated cases, while the detectives try to understand what happened to Jae-han after his disappearance 15 years earlier.