Signal (South Korean TV series)

*Signal*
Signal
	Promotional poster
Hangul	시그널
RR	Sigeuneol
MR	Sigŭnŏl
Genre	Crime; Police Procedural; Serial drama; Sci-Fi; Thriller; Mystery;
Created by	Choi Jin-hee; Park Ji-young;
Written by	Kim Eun-hee
Directed by	Kim Won-seok
Starring	Lee Je-hoon; Kim Hye-soo; Cho Jin-woong;
Music by	Kim Joon-seok; Park Sung-il; (season 1); Hwang Sang-jun (season 2);
Opening theme	"I Will Forget You"; by Jung Cha-sik
Ending theme	Various songs
Country of origin	South Korea
Original language	Korean
No. of seasons	1
No. of episodes	16 (list of episodes)
Production
Executive producers	Lee Chan-ho; Lee Sang-baek;
Producers	Lee Jae-moon; Park Eun-kyung;
Cinematography	Choi Sang-mook; Lee Joo-young;
Editor	Kim Na-young
Camera setup	Single camera
Running time	64–80 minutes
Production companies	AStory (season 1); B.A. Entertainment (season 2); Baram Pictures (season 2); Studio Dragon (season 2);
Original release
Network	tvN; AXN
Release	January 22, 2016 –; present
Related
	Signal (2018); Gyaarah Gyaarah (2024);
	Infobox instructions (only shown in preview)

Signal (Korean: 시그널) is a South Korean television series written by Kim Eun-hee, directed by Kim Won-seok, and starring Lee Je-hoon, Kim Hye-soo, and Cho Jin-woong. It was inspired by real-life criminal incidents in Korea, including the Hwaseong serial murders. The first season aired on tvN from January 22 to March 12, 2016, every Friday and Saturday at 20:30 (KST). In March 2024, a second season was confirmed to be in production.

The series received widespread acclaim from audiences and critics alike for its story and performances. It is also one of the highest-rated Korean dramas in cable television history with a peak audience viewership of 12.544% - only next to Reply 1988 (18.803%) at the time of its release in 2016.