Ten years ago, I Na’s beloved uncle, who had been like a father, mother, and best friend to her, was brutally murdered. I Na was the sole witness to the crime, but instead of being treated as a victim, she found herself under suspicion. Han Saem, the lead investigator at the time, was convinced that I Na was the killer.Now, a decade later, I Na has become a criminal profiler. For the past six years, she’s been a key member of the Criminal Analysis Team at the Seoul Metropolitan Police Agency. Known for her sharp instincts, she’s often the first to uncover a killer’s motive just by examining a crime scene.Fate brings I Na and Han Saem back together on a new case. Forced to work side by side, the tension between them simmers as old suspicions resurface. But as they dig deeper into the past, they begin to unravel the dark truth behind her uncle’s murder – one that neither of them ever expected.