KBS2's Smoking Gun Revisits a 2004 Mountain Murder: 20 Suspects, One Surprising Killer

When the body of 21-year-old Ms. Oh was found on a cliff on Mount Gajisan in Ulsan in February 2004, she had been bound at her hands and feet. She had been missing for roughly two weeks. Investigators who arrived at the scene found no murder weapon, no witnesses, and no CCTV footage, almost nothing to work with.

The upcoming episode of KBS2's true-crime series Smoking Gun, airing July 28 at 9:45 p.m., reconstructs the full story of what became one of the more painstaking cold-case investigations in the Ulsan region.

Ms. Oh was a university student in Busan, raised by her grandmother alongside an older sister under difficult circumstances. People who knew her described her as warm and socially popular, and her phone records reflected that: when detectives began working backward through her contacts to build a timeline, the number of men who needed to be interviewed and cleared kept growing. By the time the suspect list was complete, it had reached 20 names.

Investigators went through each alibi one by one. The process, painstaking by any measure, eventually narrowed the field to a single individual whose story didn't hold up. A subsequent vehicle search produced what the show calls a "smoking gun", a piece of physical evidence that shifted the entire investigation. The episode does not reveal the identity of that evidence in advance, but the show's panelists, who learn the outcome on camera, visibly struggle to process it.

"I can't believe someone like this turned out to be the perpetrator," panelist Lee Ji-hye said after the reveal. "What made it even worse was watching how he kept lying to the very end, letting people around him suffer for it. It made me furious."

An Hyun-mo was equally direct: "There was not a single word of apology to the victim. Just excuse after excuse. I found it genuinely incomprehensible."

The episode brings in two guests to add depth beyond the case timeline. Kim Jong-uk, a former detective team leader at the Ulsan North Police Station who worked the original investigation, walks through the steps that eventually led to a suspect. Psychiatrist Lee Gwang-min analyzes the psychological profile behind the crime, examining what kind of distorted thinking could have led to it.

For a case that spent years on the edge of going cold, the episode offers something the evidence at the scene never did: a clear answer.