Park Hae-young (played by Lee Je-hoon) is a protagonist in Signal.
Criminal profiler who discovers a walkie talkie connecting him to the past. He collaborates with a detective from the 1990s to solve a 15-year-old kidnapping and murder case, later helping to form a cold case team and investigating the mystery surrounding his partner's disappearance. Cha Soo-hyun (played by Kim Hye-soo) is a protagonist in Signal.
Detective who leads the newly formed cold case team. She has spent 15 years searching for Jae-han, who is her long-lost mentor and unrequited love. Lee Jae-han (played by Cho Jin-woong) appears in Signal.
A detective from the 1990s who communicates with the present via a mysterious walkie talkie. He helps solve cold cases and has been missing since the year 2000, prompting a long search by his colleague. Kim Bum-joo (played by Jang Hyun-sung) appears in Signal.
Ahn Chi-soo (played by Jung Hae-kyun) appears in Signal.
Kim Gye-chul (played by Kim Won-hae) appears in Signal.
Oh Yoon-seo (played by Jung Han-bi) appears in Signal.
Jung Heon-gi (played by Lee Yoo-jun) appears in Signal.
Signal (2016) character relationship network mapped with AI analysis. Explore the connections, alliances, and conflicts between characters.
Characters
Park Hae-young
(played by Lee Je-hoon) — protagonist
Criminal profiler who discovers a walkie talkie connecting him to the past. He collaborates with a detective from the 1990s to solve a 15-year-old kidnapping and murder case, later helping to form a c...
Cha Soo-hyun
(played by Kim Hye-soo) — protagonist
Detective who leads the newly formed cold case team. She has spent 15 years searching for Jae-han, who is her long-lost mentor and unrequited love.
Lee Jae-han
(played by Cho Jin-woong) — supporting
A detective from the 1990s who communicates with the present via a mysterious walkie talkie. He helps solve cold cases and has been missing since the year 2000, prompting a long search by his colleagu...
Kim Bum-joo
(played by Jang Hyun-sung) — supporting
Ahn Chi-soo
(played by Jung Hae-kyun) — supporting
Kim Gye-chul
(played by Kim Won-hae) — supporting
Oh Yoon-seo
(played by Jung Han-bi) — minor
Jung Heon-gi
(played by Lee Yoo-jun) — minor
Hwang Ui-kyung
(played by Kim Min-gue) — minor
Park Sun-woo
(played by Kang Chan-hee) — minor
Canonical Relationships
Family, romantic, and professional connections based on plot evidence.
Cha Soo-hyun → Ahn Chi-soo
(Professional Colleague)
Park Hae-young → Ahn Chi-soo
(Professional Colleague)
Park Hae-young → Cha Soo-hyun
(Professional Team Leader)
Park Sun-woo → Park Hae-young
(Temporal Younger Self)
Lee Jae-han → Ahn Chi-soo
(Professional Former Colleague)
Park Hae-young → Oh Yoon-seo
(Romantic Love Interest)
Story Dynamics
Alliances, conflicts, and narrative interactions that evolve throughout the story.
Park Hae-young → Park Sun-woo
(Unknown Connection)
Cha Soo-hyun → Hwang Ui-kyung
(Conflict Antagonist)
Lee Jae-han → Jung Heon-gi
(Conflict Antagonist)
Park Hae-young → Kim Gye-chul
(Alliance Team Member)
Cha Soo-hyun → Kim Bum-joo
(Conflict Enemy)
Lee Jae-han → Hwang Ui-kyung
(Unknown Case Connection)
Park Hae-young → Jung Heon-gi
(Unknown Case Connection)
Cha Soo-hyun → Kim Gye-chul
(Alliance Team Member)
Lee Jae-han → Kim Bum-joo
(Conflict Antagonist)
Story Analysis
Time-bending crime thriller connecting past and present through a walkie-talkie
Plot Progression
The Impossible Connection
Uncovering the Truth
Race Against Fate
Final Resolution
Signal (2016) · 8.2/10 · crime, drama, mystery, sci-fi-fantasy
