Tell Me Something

A detective who returns to work after his mother's death and faces a public accusation of corruption. He becomes deeply involved in the serial killer investigation and grows emotionally closer to Soo-yeon, risking professional judgment. His resolve to uncover the truth drives the investigation forward.

Daughter of a famous painter, she becomes the central figure connected to multiple victims. Her outward fragility masks a calculating and evasive nature, and the Ophelia imagery ties her to the killer's aesthetics. She ultimately escapes as the story hints at a broader, darker plan.

Soo-yeon's close friend since high school and a doctor who exposes Soo-yeon's past suicide attempts. Her information acts as a key clue in Jo's investigation, and her loyalty to Soo-yeon contrasts with the danger surrounding them.

A colleague who discovers the killings and ultimately loses his life in the pursuit of the truth. He leaves behind a photograph that serves as a crucial clue for Jo. His death highlights the perilous cost of uncovering hidden crimes.

A fellow detective who works with Jo, adding tension as the investigation unfolds. His presence reflects the investigative pressure and potential conflicts within the police department.

Part of the investigative team, contributing to the procedural aspects. His perspectives provide additional angles on Jo's case and the killer's craft.

Another member of the police squad, offering investigative insights. His role reinforces the ensemble nature of the police response to the murders.

High-ranking official overseeing the case, balancing public pressure and investigative integrity. His decisions shape the course of Jo's inquiry.

Senior official within the police department, involved in directing resources and safeguarding the investigation's scope.

Legal figure pushing for accountability and prosecutorial action, influencing the outcomes of the investigation.

A colleague relating to the art world connections in Soo-yeon's circle and the painting motif central to the case.

Mother of Soo-yeon, depicted as a figure who may hold family secrets and influence Soo-yeon's past. Her presence amplifies the familial pressures surrounding Soo-yeon.

Soo-yeon's father, implied to have long-term abuse, providing a dangerous background that feeds the killer's psychology and Soo-yeon's trauma.