Climax (클라이맥스): The K-Drama Power Struggle You Can’t Look Away From

What Climax Is About

Prosecutor Bang Tae Seop (Ju Ji-hoon) has clawed his way up from a poor background to become a feared figure in the Seoam District Prosecutor’s Office.

But the office is rotten—corrupt, money-driven and stacked against anyone without the right connections. Determined to break the system from within, Tae Seop hatches a daring, high-risk plan: expose Mayor Nam Hye Hun and use the scandal as his launchpad into politics.

To pull it off, he recruits Hwang Jeong Won (Nana), a former suspect from one of his own cases who is now a sharp, resourceful intelligence operative. He also brings in Kwon Jong Uk (Oh Jung-se), the eldest son of WR Group who wants the powerful second wife Lee Yang Mi (Cha Joo-young) removed from the family empire.

But every move Tae Seop makes drags him deeper into danger. His wife, former top actress Chu Sang Ah (Ha Ji-won), is fighting her own battles—her career is stalling, a decade-old murder case is resurfacing, and she may be hiding secrets that could destroy them both.

As the power cartel tightens around every player, alliances fracture and everyone must decide: are they the predator or the prey?

Why Climax Is One of the Best Korean Dramas to Watch in 2026

1. A Cast You Won’t Stop Watching

Climax is one of those top Korean drama series where every single lead brings their A-game:

• Ju Ji-hoon brings cold, calculating charisma to a man who uses everyone around him as a chess piece—including his wife.

• Ha Ji-won, one of Korea’s most beloved veteran actresses, plays Sang Ah as a woman whose glamorous surface barely contains a storm of fear, secrets and raw survival instinct.

• Nana is a standout as Jeong Won—morally ambiguous, fiercely intelligent and the most unpredictable piece on the board.

• Cha Joo-young as Yang Mi is the kind of villain who makes you understand exactly why she does what she does, which makes her twice as terrifying.

• Oh Jung-se adds darkly comedic menace to Kwon Jong Uk, an heir whose polished exterior cracks the moment he opens his mouth.

2. Political Noir Done Right

Directed and written by Lee Ji-won (known for Miss Baek, 2018), Climax is built on sharp, layered storytelling where no character is simply good or evil. It’s the kind of best Korean drama with complex characters that rewards close attention—every scene contains information, every conversation is a negotiation.

3. Real Stakes and Rising Tension

Episode 1 already set a nationwide rating of 2.919%, climbing to 3.834% in Episode 2—impressive numbers for a cable drama, signalling strong word-of-mouth and a story that immediately grabs its audience. Among Korean dramas on Viu in 2026, this is shaping up to be essential viewing.

Cast at a Glance

Main Cast

Ju Ji-hoon as Bang Tae Seop

– A prosecutor who rose from poverty through sheer will and ruthlessness, only to find the system he fought to enter is rotten to its core. Rather than walk away, he weaponises the corruption around him, using marriage, scandal and carefully placed allies to engineer his own path to political power. Calculating, cold and dangerously charming, Tae Seop is the kind of man who treats every relationship as a transaction—until the variables start behaving unpredictably.

Ha Ji-won as Chu Sang Ah

– Once South Korea’s most captivating actress, Sang Ah shocked the industry by marrying a prosecutor in what many saw as a sudden, suspicious move.

Behind the headlines, her films are flopping, a decade-old murder case is quietly resurfacing, and she is increasingly under the influence of the powerful Lee Yang Mi. She presents the image of a woman in control, but the cracks are widening—and what she is hiding from Tae Seop may be far more dangerous than either of them is prepared for.

Nana as Hwang Jeong Won

– Jeong Won’s life changed the night her mother died and she was accused of murdering her father.

The prosecutor who handled her case was Tae Seop, and years later, after her release from prison, he finds her again—and recruits her as his personal intelligence operative. She is sharp, adaptive and willing to operate in the shadows, but her loyalty is never unconditional. Of all the players in the power game, she is the one most likely to rewrite the rules entirely.

Oh Jung-se as Kwon Jong Uk

– The eldest son of WR Group and executive director of WR Construction, Jong Uk carries the polish of inherited privilege and the frustration of a man who feels his birthright slipping away. When his father remarried Lee Yang Mi six years ago, Jong Uk watched her consolidate influence over the family empire. His alliance with Tae Seop is entirely transactional: they share one goal—push Yang Mi out—but their methods and end games are very different, which makes their partnership as unstable as it is useful.

Cha Joo-young as Lee Yang Mi

– The second wife of WR Group’s chairman and president of WR Hotels & Entertainment, Yang Mi has built real power from a position that many underestimated.

She moves effortlessly between the conglomerate world and the entertainment industry, with influence in both spheres. As her goals finally come within reach, an unexpected event threatens everything—and Yang Mi does not accept setbacks quietly.

Supporting Cast

Han Dong Hee as Han Ji Su  

– An actress operating within the entertainment industry orbit that intersects with both Sang Ah’s fading career and Yang Mi’s sphere of control.

Oh Seung Hoon as Choi Ji Ho

– The creator of the “Cyber Wrecker” channel, suggesting a role in the drama’s media manipulation and public scandal dimensions.

Seo Hyeon Woo as O Gwang Jae

– A film producer appearing in a guest role, adding another layer of industry intrigue to the story’s entertainment world backdrop.

Director & Screenwriter: Lee Ji-won (co-written with Shin Ye-seul)

Watch Climax on Viu

Climax airs every Tuesday & Wednesday on Viu, with new episodes available to watch Korean drama online on Viu with multiple subtitles including English, Traditional Chinese, Simplified Chinese, Malay, Bahasa Indonesia and Thai.

If you’re searching for the best Korean drama to watch right now, Climax (클라이맥스) is exactly that: a tightly written, beautifully acted political noir where everyone is reaching for the top—and no one’s hands are clean.