In a city where traditional policing feels almost ceremonial, a girl named Ha Yoon-joo joins a small, offbeat police division that operates without firearms and without the usual uniforms. This unit, led by a steady, cautious commander we come to know as [Chief Hwang], works by shadowing suspects and gathering clues rather than making quick arrests. Their method is methodical, almost patient: follow potential criminals, observe their habits, and let the data guide their next move. The atmosphere is tense but sincere, a patient drumbeat of surveillance that prefers persistence to bravado.
The routine is shaken when a bank is robbed and only one of seven culprits is captured on camera. The incident becomes a turning point, pushing [Chief Hwang] and Ha into weeks of aimless wandering through crowded streets, alleys, and transit hubs, chasing silhouettes that resemble the robber. They assemble a mosaic of clues, tagging people who match the physical description and mapping patterns that might lead to the perpetrator. When the team finally narrows the field enough, they install cameras outside the suspect’s apartment, turning a private space into a stage for accountability.
Parallel to this, the criminal world begins to pulse with a quieter, more dangerous energy. James, the leader of the gang, dreams of stepping away from crime, but an aging mentor remains persuasive and ruthless. The mentor sends a killer to erase James’s hesitation, and James defends himself against this lethal threat. The tension within the criminal circle builds as they regroup and plan the next operation, only to be tracked by Ha and the others, who orchestrate a rapid response with a SWAT team to subdue the fleeing crew.
The tension deepens when James, who has managed to avoid capture momentarily, must confront the consequences of his mentor’s orders. After a tense confrontation, James murders the mentor and the mentor’s bodyguards, a grim and defining moment that marks James as desperate to claw toward freedom. He acquires a counterfeit Thai passport, signaling a final bid to slip out of South Korea’s reach and into a life that no longer centers on crime.
Back in the police division, the scene grows heavy with sadness. The deaths of a fellow officer and the moral weight of the pursuit push [Chief Hwang] toward resignation, while Ha decides to take a leave of absence, seeking time to process the human cost of the chase. Yet fate has other plans. While doing her laundry, Ha recalls a crucial detail from the past—the moment on the day of her police interview when she briefly crossed paths with James in a subway car, carrying a grocery store brochure. This memory becomes a beacon, and she rushes to the subway and grocery store to confirm what her recollection suggests.
The pursuit resumes with renewed urgency. When James steps into a tunnel, [Chief Hwang] reenters the chase, but James recognizes the officer and manages to stab him. The wound, fortunately, is not mortal, but the attack intensifies the stakes. Ha presses on, pursuing James into the subway tunnels, where she too is briefly held hostage as the killer gauges his odds in a life-or-death game.
When the SWAT team closes in, James lets Ha go and darts deeper into the labyrinth. The chase spirals toward a dramatic hinge point: James finds himself sandwiched between the advancing SWAT force and the tunnel mouth, which is guarded by a long-circuiting path taken by the determined chief. As James charges toward the officer at the tunnel junction, the train looms as a brutal partner in the pursuit. The plan unfolds with a narrow, fateful precision—the train takes a different path, and [Chief Hwang] fires, forcing James into the line of fire. The fatal shot ends James’s bid for escape, a stark moment that seals the outcome of their cat-and-mouse battle.
With the immediate danger resolved, [Chief Hwang] chooses to continue the work rather than retreat. He withdraws his resignation and, together with Ha, embraces a broader mission: to pursue increasingly complex threats, including international terrorists. The story closes on a note of quiet resolve, painting a picture of a team that learns from every encounter, balancing caution with courage, and moving forward with a renewed sense of purpose in the face of dangerous, evolving threats.
