Plot

Officers Kyung-yoon CHO and Eun-joo PARK are on the hunt a killer following duo of ghastly murders. The victims carry a common military past, and the secret of their past must be unraveled to find the killer.

In the bustling city of Seoul, a shocking murder takes place inside a high-end fitness club. The crime scene is grisly and unsettling, with signs of calculated brutality. Detective Cho Kang-seok, known for his uncompromising methods and blunt personality, is assigned to the case alongside his capable partner, Detective Park Eun-ju. What initially seems like a straightforward murder investigation soon turns into a labyrinth of secrets, hidden identities, and past wounds that refuse to stay buried.

As the detectives gather evidence, they discover that the victim, a former elite military officer, was not as respected as he appeared. Layers of his past reveal a history of cruelty, abuse, and psychological torment inflicted on those weaker than him. Several suspects emerge, all with motives rooted in vengeance and trauma, but the case takes a darker and more personal turn when connections are drawn to a violent incident that occurred during the victim's time in the military. The detectives come to realize that the murder is not just about settling old scores-it is a cry for justice from someone who was deeply wronged.

The deeper Kang-seok and Eun-ju probe, the more tangled the narrative becomes. They confront questions of gender identity, abuse of authority, and the long-lasting scars of violence. Each revelation pushes them closer to the truth, but also forces them to confront their own moral boundaries and the price of justice. Ultimately, the investigation leads to a climactic confrontation where the line between victim and perpetrator dissolves. The shocking truth challenges not only the detectives' perceptions but also the audience's understanding of revenge, redemption, and the hidden struggles of those living on the margins of society.

Rainbow Eyes blends the intensity of a crime thriller with the emotional depth of a psychological drama. It is a film that unsettles and provokes, asking difficult questions about identity, justice, and the unseen pain people carry beneath the surface.