A Killer Paradox: how to watch, plot, cast and everything we know

Jang Nan-gam (Son Suk-ku) with a gun to Lee Tang's (Choi Woo-shik) head in Netflix's A Killer Paradox.
(Image credit: Song Kyoung Sub/Netflix)

A Killer Paradox is a Netflix K-drama about the dangerous conflict between Lee Tang and a dogged detective.

Lee Tang's life is turned upside down when the submissive college student ends up fighting back for once in his life and ends up killing a person. Soon, he finds himself under the watchful eye of Detective Jang.

However, Lee's attitude suddenly takes a turn when he realizes his first victim was a malicious serial killer, and he decides to become an agent of "justice", taking out more evildoers whilst Jang is on his tail.

Here's everything you need to know about A Killer Paradox...

A Killer Paradox release date

A Killer Paradox is now streaming on Netflix after releasing on Friday, February 9.

If you're looking to watch more K-content, don't forget to check out our round-up of the best Korean dramas on Netflix, too.

How many episodes of A Killer Paradox will there be?

Netflix has confirmed that the first series of A Killer Paradox is comprised of eight episodes.

A Killer Paradox cast

Detective Jang Nan-gam (Son Suk-ku) squatting at a crime scene in A Killer Paradox

Detective Jang Nan-gam. (Image credit: Song Kyoung Sub/Netflix)

A Killer Paradox stars Choi Woo-shik as Lee Tang, the average college student who becomes an accidental killer.

Son Suk-ku co-stars as Detective Jang Nan-gam, the investigator hot on Lee's heels.

In addition, A Killer Paradox also features:

  • Lee Hee-jun as Song Chon
  • Hyun Bong-sik
  • Nam Jin-bok
  • Kim Geum-soon
  • Han Sang-kyung

A Killer Paradox plot

A Killer Paradox is a story about the psychological cat-and-mouse game between an everyday student who finds himself killing evildoers and a detective trying to bring him to justice.

A more in-depth Netflix summary reads: "The story begins when Lee Tang, a submissive man who doesn’t normally fight back, accidentally kills a person. Haunted by fear and guilt, Lee is constantly on edge, and the detective, Jang Nan-gam, is suddenly on his tail. The psychological warfare is carried out between the two with Jang keeping a close eye on changes in Lee’s demeanor.

"Just as Lee decides to turn himself in, the news that comes on instantly changes the atmosphere: The victim of Lee’s first murder is a malicious serial killer. There’s a noticeable shift in Lee’s character, evolving from a murderer into a condemner. The plot explores themes such as morality, justice, and personal transformation, with Lee’s evolution from a regular guy to a self-proclaimed judge of justice."

It's based on the original webtoon of the same name (penned by KKomabi) and has been brought to life with Lee Chang-hee (Strangers From Hell, The Vanished) serving as director.

A Killer Paradox episode guide

Below, you can find the short episode summaries for each of A Killer Paradox's eight episodes:

  • A Killer Paradox episode 1: Flailing at life, Lee Tang panics after he kills a man after work. Soon, Jang Nan-gam is on the case — discovering a disturbing truth about the victim.
  • A Killer Paradox episode 2: A mysterious woman approaches Tang, claiming to know his secret and begins to blackmail him. The weight of his actions starts taking a mental toll.
  • A Killer Paradox episode 3: Nan-gam struggles to find clear answers as he investigates the latest deaths. After connecting with an enigmatic figure, Tang decides to turn himself in.
  • A Killer Paradox episode 4: Wondering if the same killer is behind all the murders, Nan-gam probes Roh Bin for clues, leading to an unlikely partnership between the two.
  • A Killer Paradox episode 5: As Nan-gam notices a clear pattern among the recent murders, he searches for Tang — unaware of another mysterious man who is doing the same.
  • A Killer Paradox episode 6: In his search for Tang, Song Chon confronts Bin — who desperately turns to Nan-gam for help. But Tang agrees to meet with Chon, who has a proposition.
  • A Killer Paradox episode 7: Nan-game comes face to face with Chon, who recognizes him from the past. As Bin and Tang plan their final escape, Bin receives a menacing phone call.
  • A Killer Paradox episode 8: The endgame to the chase leads to a final fight — and it's everyone versus Chon. In the process, Nan-gam finally learns the truth about his father. 

Is there A Killer Paradox trailer?

The first tease for A Killer Paradox arrived in mid-January. It shows us our mild-mannered star, Lee Tang, who inadvertently becomes a killer after being hassled in the street. It also hints at the cat-and-mouse game between Lee and the detective who is on his trail. Check it out below:

The full A Killer Paradox trailer dives deeper into the story. Lee's plagued by guilt over his actions, but when he realizes that his target "deserved to die", his demeanor seems to change, and we're invited to ask whether he's a "Godsent Hero" or an "Unpunished Sinner".

Netflix has also released a making-of featurette about the new series which offers a more in-depth look at the characters from the new series. You can find that below, too:

Martin Shore
Staff Writer at WhatToWatch.com

Martin is a Staff Writer with WhatToWatch.com, where he produces a variety of articles focused on the latest and greatest films and TV shows. 

Some of his favorite shows are What We Do In The Shadows, Bridgerton, Gangs of London, The Witcher, Doctor Who, and Ghosts. When he’s not watching TV or at the movies, Martin’s probably still in front of a screen playing the latest video games, reading, or watching the NFL.