Rainbow Eyes

A relentless detective whose guarded past and unspoken love drive his pursuit of the killer. He is capable of calculating method and brutal violence, yet harbors deep guilt and tenderness, which conflict with his professional instincts.

Kyung-yoon's girlfriend, loyal yet morally conflicted. She grows more entangled in the case as she uncovers dangerous truths, all while keeping silent about Kyung-yoon's possible involvement.

Yoon-Suh's sister, emotionally torn and protective. She reveals crucial connections between the victims and the past, helping to uncover the killer's identity.

Kyung-yoon's gentle, previously abused friend who becomes a focal point of the backstory. He did not kill anyone, but his past experiences drive the investigation's emotional undercurrents.

A hostile, dismissive member of the trio tied to the victims' past. He antagonizes Kyung-yoon and amplifies the conflict leading to tragic revelations.

The kitchen worker who kills the rapists and plays a pivotal role in the killer's backstory. His actions reveal a deeper, unspoken motive tied to love.

A victim whose past connections to the trio and the crime drive much of the investigation’s motive and reveal the troubled dynamics behind the murders.

A police investigator who questions the singer and other leads as part of the murder investigation.

Another investigator who compares the MO across the two murders and navigates the complicated interpersonal dynamics within the squad.

A character connected to the investigation with insights into Kyung-yoon's past and relationships.

The authority figure overseeing the case, often clashing with the detectives as the investigation unfolds.