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There are those who are born monsters, but there are also those who are made into monsters by people.


Detectives from the present and a detective from the past communicate via walkie-talkie to solve a long-time unsolved case.

  1. Kim Eun-hee


  2. Kim Won-suk


Series Cast

  1. Son Hyun-joo as Jang Young-chul and Congressman Jang Young-chul

    Son Hyun-joo

    Jang Young-chul, Congressman Jang Young-chul

    17 Episodes

  2. Lee Je-hoon as Park Hae-young

    Lee Je-hoon

    Park Hae-young

    16 Episodes

  3. Kim Hye-soo as Cha Soo-hyun

    Kim Hye-soo

    Cha Soo-hyun

    16 Episodes

  4. Cho Jin-woong as Lee Jae-han

    Cho Jin-woong

    Lee Jae-han

    16 Episodes

  5. Jang Hyun-sung as Kim Bum-joo

    Jang Hyun-sung

    Kim Bum-joo

    16 Episodes

  6. Jung Hae-kyun as Ahn Chi-soo

    Jung Hae-kyun

    Ahn Chi-soo

    16 Episodes

  7. Kim Won-hae as Kim Gye-chul

    Kim Won-hae

    Kim Gye-chul

    16 Episodes

  8. Jung Han-bi as Oh Yoon-seo

    Jung Han-bi

    Oh Yoon-seo

    16 Episodes

  9. Lee Yoo-jun as Jung Heon-gi

    Lee Yoo-jun

    Jung Heon-gi

    16 Episodes

  10. View More

Full Cast & Crew

Last Season

Season 1

2016 • 16 Episodes

Communicating via a walkie-talkie that transcends time, a profiler from 2015 and a detective from 1989 join forces to tackle crimes and injustice.

If You Don't Give Up

(1x16, March 12, 2016) Season Finale

View All Seasons



Original Name 시그널

Status Ended


  • See more TV shows from tvN...

Type Scripted

Original Language Korean


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