The Worst of Evil

Everything you need to decide, in one place.

The faces behind the 1995 Seoul underworld.

Ji Chang-wook

Park Jun-mo

Lead

Wi Ha-jun

Jung Gi-cheol

Antagonist

Lim Se-mi

Yoo Eui-jeong

Lead

BIBI

Lee Hae-ryeon

Supporting

Im Sung-jae

Choi Jeong-bae

Supporting

Ji Seung-hyun

Seok Do-hyung

Supporting

All 12 episodes — spoiler-light recaps to help you decide where to start and when to keep going.

EP 01

Into the Dark

September 27, 2023

Set in 1995, countryside detective Park Jun-mo is recruited for a high-stakes undercover operation targeting the Gangnam Union — a rising criminal syndicate controlling a massive cross-border drug trade. Jun-mo dives into the criminal underworld, assuming a false identity to get close to the organization’s inner circle. The mission begins shrouded in danger, and the stakes become immediately clear: he is not just going undercover, he is going to disappear.

EP 02

Passing the Test

September 27, 2023

Jun-mo barely survives the brutal initiation set by Gangnam Union’s boss Jung Gi-cheol and officially joins the gang’s ranks. Inside, he uncovers a shocking truth that complicates the mission before it has properly begun. The episode deepens the tension between Jun-mo’s duty as a detective and the criminal persona he is building — and Wi Ha-jun’s Gi-cheol announces himself as the kind of villain you cannot take your eyes off.

EP 03

The Wrong Face

October 4, 2023

Jun-mo’s cover is threatened when his wife, narcotics officer Yoo Eui-jeong, unexpectedly surfaces near the investigation zone — putting the entire undercover squad at risk. Meanwhile, Gi-cheol grows suspicious about the previous night’s attack, sharpening his razor-keen instincts. The two threads on a collision course become visible for the first time, and the personal stakes suddenly dwarf the professional ones.

EP 04

Three People, One Problem

October 4, 2023

Eui-jeong is reluctantly pulled into protecting Jun-mo’s cover during a critical crisis moment — and her involvement ignites the love triangle at the center of the show. As she gets closer to Gi-cheol, and Jun-mo watches from the inside, the emotional geometry becomes genuinely dangerous. Nobody is playing the situation they wanted. This is where the drama stops being a crime show and becomes something heavier.

EP 05

Trust and Jealousy

October 11, 2023

Jun-mo successfully earns Gi-cheol’s trust — a meaningful advance in the mission — but his anxiety escalates as he watches Gi-cheol grow closer to Eui-jeong. The jealousy is not just personal; it is tactical. Jun-mo cannot tell where his instinct to protect his wife ends and where his identity as a detective begins. The show’s best quality surfaces here: its characters are not behaving in clean, legible ways.

EP 06

Pressure from Outside

October 11, 2023

A delivery accident puts the drug trade at serious risk, threatening the operation Jun-mo has carefully embedded himself in. Detective Hwang from the police department begins closely monitoring the Gangnam Union, adding external pressure from an unexpected angle. Jun-mo now has threats coming from both sides of the law — and managing both without blowing his cover requires compromises that leave marks.

EP 07

An Extreme Measure

October 18, 2023

Lee Hae-ryeon, a woman connected to the criminal world, shows romantic interest in Jun-mo — further entangling his undercover life. Eui-jeong begins actively approaching Gi-cheol to extract intelligence, walking a line that grows more dangerous with each step. Under compounding pressure, Jun-mo takes a morally extreme measure to protect the mission — one that will cost him something he cannot get back.

EP 08

The Point of No Return

October 18, 2023

Gi-cheol’s suspicions about Jun-mo’s true identity intensify dramatically, bringing the operation to the edge of collapse. All four central characters — Jun-mo, Eui-jeong, Gi-cheol, and Hae-ryeon — make irreversible decisions that set off the drama’s biggest crisis yet. The episode earns its title. Nobody is walking any of this back. The show’s willingness to make its characters pay full price is what separates it from most K-drama crime thrillers.

EP 09

Unexpected Alliance

October 18, 2023

A violent clash with the rival Jaegeon gang fractures alliances within the underworld, creating an opening Jun-mo moves to exploit. He strategically aligns with Hae-ryeon to restart the stalled drug trade and preserve his cover — an alliance built on mutual self-interest with no clean exits for either party. The power balance between the criminal factions begins to shift decisively, and Jun-mo is now operating deep inside a war he started.

EP 10

Breaking Point

October 25, 2023

Jun-mo and Eui-jeong struggle to balance their emotional bond with the demands of their dangerous duties, as their relationship approaches its breaking point. Detective Hwang continues to interfere with the operation from the inside, threatening to derail everything both of them have sacrificed. The final phase of the mission is set into motion — and the show makes clear that not everyone is going to make it out of this intact.

EP 11

The Last Night

October 25, 2023

An unexpected accident abruptly derails the planned drug trade operation and plunges the mission into chaos. Eui-jeong and her colleague Seok Do-hyung grow increasingly desperate as Jun-mo’s safety becomes uncertain. The episode builds to a fever pitch — every character pushed to their limit, every choice made in the previous ten episodes coming due at once. The final scene is the best this show has produced.

EP 12

What It Cost

October 25, 2023

Korean, Chinese, and Japanese law enforcement coordinate a massive joint operation as everything converges on the final drug deal. Jun-mo makes a devastating choice that the show has been building toward since the pilot — one that dismantles the cartel but leaves his marriage in pieces. The finale is not interested in comfort. It delivers a reckoning, not a resolution, and the image it closes on is one of the more haunting endings in recent K-drama crime history.

Everything the finale means, spoilers and all.

The Final Operation. The finale brings Korean, Chinese, and Japanese law enforcement agencies together in a coordinated joint arrest operation around the Gangnam Union’s last drug deal. Jun-mo is on the inside — still undercover, still playing both sides — as the net closes around everything he has spent twelve episodes helping to build. The operational machinery works. The cartel is dismantled. The Gangnam Crystal trade is shut down. On paper, the mission succeeds. But the show has spent twelve episodes making clear that paper is not what this story is about.

Jun-mo’s Choice. As Gi-cheol faces arrest, Jun-mo makes the decision that defines the drama: understanding that Gi-cheol — a man who dragged himself out of darkness partly for Eui-jeong, who loved her with the full weight of a person who had nothing else — cannot be taken alive without cursing her with survivor’s guilt for the rest of her life. Jun-mo shoots Gi-cheol himself. He takes the choice out of fate’s hands. It is not mercy, exactly. It is closer to a final act of protection for the woman he loves, performed by killing the other man she could not stop caring about.

Gi-cheol’s Death and Its Aftermath. The drug cartel collapses. Gi-cheol is dead. The people who were supposed to win have won. But the show refuses to frame it as victory. Jun-mo leaves his wedding ring at Gi-cheol’s grave — not as a declaration of hatred, but as an acknowledgment that what he and Eui-jeong went through together cannot be survived without cost. Eui-jeong, in turn, leaves the necklace Gi-cheol gave her in their youth at his grave — releasing her past and her ties to him, mourning someone she could never have saved and never fully stopped grieving.

The Separation. Jun-mo and Eui-jeong do not end up together. The separation is not dramatic — there is no confrontation, no final argument — which makes it feel more honest than a scripted breakup ever could. They have simply been through too much, and done too much to each other, to pretend that coming out the other side means coming out together. The show earns this ending because it has spent twelve episodes showing, step by step, exactly what it cost both of them to stay in that operation. Love surviving everything is a fairy tale. This is not a fairy tale.

The Door Left Open. The final scene — Eui-jeong at the grave, releasing her past — does leave an ambiguity. The show does not close the door entirely on the idea that these two people, changed and scarred, might eventually find each other again on the other side of grief. It just refuses to hand that to you. What it gives you instead is harder and more interesting: two people who chose the mission over themselves, and are now left with the truth of what that means. The worst of evil, the show argues, is not the drug cartel. It is what good people do to each other in the dark.