Cast: Jang Hyun-sung, Kim Won-seok, Kim Eun-hee, Kim Hye-soo, Cho Jin-woong, Lee Je-hoon
Connected across decades through a mysterious, battery-less walkie-talkie, Signal follows a passionate 1980s detective and a cynical modern-day criminal profiler as they join forces across time to solve notorious cold cases—only to discover that altering the past comes with perilous, unintended consequences, starring Lee Je-hoon, Kim Hye-soo, and Cho Jin-woong.
