Mystery K-dramas have become fan favorites, pulling viewers into thrilling storylines filled with secrets and unexpected twists. If you’re craving suspense and mind-bending plots, these 7 all-time best mystery K-dramas should be on your must-watch list!
1. Signal (2016)
Aired On: January 22, 2016
No. of Episodes: 16
Main Cast: Lee Je Hoon, Kim Hye Soo, Cho Jin Woong
Streaming Platform: Netflix
Fifteen years ago, young Park Hae Young (Lee Je Hoon) witnessed a chilling crime: the kidnapping and murder of a girl near his school. With the police failing to find the killer, Hae Young grew up distrustful of law enforcement.
Now a police officer and profiler, Hae Young discovers a mysterious walkie-talkie connecting him to Detective Lee Jae Han (Cho Jin Woong) in the past. Alongside Jae Han and Cha Soo Hyun (Kim Hye Soo), Hae Young aims to solve cold cases and bring long-buried truths to light.
Taxi Driver (2021)
Aired On: April 9, 2021
No. of Episodes: 16
Main Cast: Lee Je Hoon, Esom, Kim Eui Sung
Streaming Platform: Viki
Former Special Forces officer Do Gi (Lee Je Hoon) endures heartbreak after his mother’s murder, feeling betrayed by the justice system. His life takes a turn when he joins Rainbow Taxi, an underground service that avenges those failed by the law.
As Rainbow Taxi’s top driver, Do Gi delivers justice with each mission. Meanwhile, prosecutor Ha Na grows suspicious of the vigilante organization, torn between condemning their methods and admiring their results. Together, they grapple with the blurred lines of justice and revenge.
Mouse (2021)
Aired On: March 3, 2021
No. of Episodes: 20
Main Cast: Lee Seung Gi, Lee Hee Joon, Park Ju Hyun
Streaming Platform: Viki
In a society paralyzed by fear, a brutal serial killer’s reign of terror raises the question: can we detect psychopaths before they harm? Rookie cop Jung Ba Reum (Lee Seung Gi) faces off with the killer, barely surviving the encounter.
Following this brush with death, Jung Ba Reum’s life spirals, confronting dark truths that force him to question everything. In a quest for justice, he must grapple with the unsettling possibility of predicting — and preventing — evil.
Healer (2014 - 2015)
Aired On: December 8, 2014
No. of Episodes: 20
Main Cast: Ji Chang Wook, Park Min Young, Yoo Ji Tae
Streaming Platform: Viki
Seo Jung Hoo (Ji Chang Wook), known as "Healer," is a skilled night courier with a mysterious past who takes on dangerous jobs for the right price. His latest mission connects him with reporter Chae Young Shin (Park Min Young) and veteran journalist Kim Moon Ho (Yoo Ji Tae).
As he uncovers dark secrets from the past, Jung Hoo's life intertwines with Young Shin's, revealing a story of hidden identities, old betrayals, and love. Together, they risk everything to expose the truth and find justice.
The Judge from Hell (2024)
Aired On: September 21, 2024
No. of Episodes: 14
Main Cast: Park Shin Hye, Kim Jae Young, Kim In Kwon, Kim Ah Young
Streaming Platform: Disney+
Kang Bit Na (Park Shin Hye), a striking yet fearsome judge, hides a dark secret — she’s a demon who punishes the unrepentantly wicked. Her duty is to condemn those who bring harm to others, sending them straight to Hell.
When she crosses paths with Han Da On (Kim Jae Young), a perceptive detective carrying hidden pain, their lives take unexpected turns. Together, they face dangerous truths, challenging their own beliefs on justice and redemption.
SKY Castle (2018 - 2019)
Aired On: November 23, 2018
No. of Episodes: 20
Main Cast: Yum Jung Ah, Lee Tae Ran, Yoon Se Ah, Oh Na Ra, Kim Seo Hyung
Streaming Platform: Netflix
In the luxurious, competitive world of SKY Castle, wealthy families stop at nothing to secure elite futures for their children. Each family harbors intense ambitions, pushing their kids to excel in school and gain admission to prestigious universities.
But as secrets and rivalries unfold, parents find themselves paying the price for their obsessive pursuit of success. This dark satire explores the lengths people will go to for status and the emotional toll it takes on everyone involved
Beyond Evil (2021)
Aired On: February 19, 2021
No. of Episodes: 16
Main Cast: Shin Ha Kyun, Yeo Jin Goo
Streaming Platform: Netflix
In the quiet town of Manyang, a string of murders reopens a dark past, bringing two detectives face to face with terrifying truths. Veteran cop Lee Dong Sik (Shin Ha Kyun), once suspected of a similar crime, teams up with young detective Han Joo Won (Yeo Jin Goo).
As they dig deeper, the two detectives begin suspecting everyone, even each other, in a relentless search for the killer. Beyond Evil explores trust, betrayal, and the lengths people will go to for justice.
Each of these mystery K-dramas offers a unique storyline, unforgettable characters, and spine-chilling mysteries. From crime-solving detectives to mind games and supernatural twists, these dramas are perfect for a binge-worthy night.
Which K-drama on this list intrigued you the most? Let us know in the comments, and don’t forget to follow Dojeon Media for more K-drama recommendations!
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