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Pierce Conran

Lead cast: Ryeoun, Keum Sae-rok, Sung Dong-il
The year 2026 welcomes its first serial killer K-drama with the high-concept Bloody Flower, a series that toys with whether a life can ever be taken in the name of the greater good.
Leading the show are Ryeoun (Weak Hero Class 2) as a medically minded mass murderer, Keum Sae-rok (The Interest of Love) as the driven prosecutor gunning for the death sentence, and Sung Dong-il (Typhoon Family) as the wily lawyer trying to get him off the hook.
Blending courtroom thrills into its procedural elements, the series is the latest addition to the legal K-drama trend, following hot on the heels of The Judge Returns and Honour, both currently airing.


Taking centre stage is Lee Woo-gyeom (Ryeoun), a medical prodigy arrested in the opening scenes while operating on his latest victim. Eerily composed, Woo-gyeom surrenders without a fight and soon volunteers that he has claimed 17 lives to date and that their body parts are stored in a freezer behind him.
Yet he says that his arrest has not interrupted his murderous spree; it has merely come at the end of it, just as he had planned.
Cha Yi-yeon (Keum) is a prosecutor who was born into privilege and is desperate to make her own name. She begs her superior to give her the Woo-gyeom case, staking her reputation on the outcome by promising to secure a death sentence.
Combative and impatient, Yi-yeon at first gets little out of Woo-gyeom, who is content to toy with her, but soon his ego compels him to reveal the locations of buried bodies and explain his master plan.

He maintains that the murders were experiments conducted to cure incurable diseases. He also claims to have succeeded and is adamant that he will prove it to the world in court.
Enter Park Han-jun (Sung), a shrewd and experienced lawyer struggling to pay his sick daughter’s medical bills. Woo-gyeom reaches out to him, promising a big payday if he agrees to represent him.
Despite the lucrative offer, Han-jun is disinclined to represent an arrogant young man he believes to be a monster. He is also loath to believe Woo-gyeom’s claim that he has performed miracle cures – until he seeks out one of Woo-gyeom’s former patients and sees the results for himself.
The murderous exploits of a brilliant medical mind in Bloody Flower call to mind the Disney+ thriller Hyper Knife starring Park Eun-bin, which was released less than a year ago, in March 2025.

Both are stylised, heightened experiences that play fast and loose with human psychology and morality as they attempt to forge a new path in well-worn terrain.
Hyper Knife had more flash and ambition, while Bloody Flower is more grounded and easier to get into, with a concept that offers up a clear moral conundrum: is murder ever justifiable?
Part of that clarity is down to the familiar archetypes of the lead roles, which allow us to settle into the show’s themes – at least before the plot thickens.
The venerable Sung plays one of the most rote characters in modern Korean media – the father struggling to pay his dying daughter’s hospital bills – but thanks to the practised ease of his worn amiability, he is one of the few actors who can make this stock character stand out.

Keum struggles a little more with her dogged prosecutor, which arguably lacks definition. As the most thinly drawn character, her aggression feels unmotivated.
As the genius young killer with a twinkle in his eye, Ryeoun is also playing a very familiar role. By design, the character is difficult to read at this point, so the actor’s real test will come later, when Woo-gyeom’s cards are laid out on the table.
Since the killer is already identified, Bloody Flower pivots from “whodunnit” to “whydunnit”. Judging by previous Korean thrillers, high concepts can get the ball rolling, but they often lead to a game of one-upmanship that can be difficult to sustain, resulting in diminishing returns.
An eight-episode order works in the show’s favour, hopefully answering its central question before the novelty fades. We likely already know the verdict on its moral dilemma; the real test is whether the series can sustain our interest long enough to deliver it.
Bloody Flower is streaming on Viu.


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Keum Sae-rok as the prosecutor Cha Yi-yeon in a still from Bloody Flower.

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Ryeoun stars as a serial killer and medical genius on trial for multiple murders, while veteran Sung Dong-il plays his defence lawyer


Ryeoun stars as a serial killer and medical genius on trial for multiple murders, while veteran Sung Dong-il plays his defence lawyer.


K-drama Bloody Flower: serial killer drama weighs a medical prodigy’s deadly cure

.css-1c6uqr6{color:inherit;font-weight:inherit;font-size:inherit;font-family:inherit;line-height:inherit;overflow-wrap:break-word;}Ryeoun stars as a serial killer and medical genius on trial for multiple murders, while veteran Sung Dong-il plays his defence lawyer

Ryeoun stars as a serial killer and medical genius on trial for multiple murders, while veteran Sung Dong-il plays his defence lawyer