The Second Signal (2026 Korean Drama) - Season 1

The Second Signal is a Korean crime thriller, mystery, noir, and science-fiction drama that continues the story of tvN’s acclaimed series Signal. Criminal profiler Park Hae-young and detective Cha Soo-hyun once again use a mysterious radio to communicate with detective Lee Jae-han, who is investigating crimes from the past. Their connection allows them to reopen cold cases, expose hidden corruption, and alter events across time.

However, every change creates unpredictable consequences. As the team searches for the truth behind Jae-han’s disappearance, they face new criminals, buried secrets, and a conspiracy that threatens both the past and the present. The drama stars Lee Je-hoon, Kim Hye-soo, and Cho Jin-woong, with Kim Eun-hee returning as screenwriter and Ahn Tae-jin directing.