An inspector belonging to the Violent Crime Investigation Team of the National Police Agency's Special Investigation Unit. A veteran detective who ranks at the top in both field arrest rates and case resolution rates, he possesses an intuition for reading criminal psychology and excellent situational judgment. He prefers field investigations over writing reports, and is the first to arrive at the scene and the last to leave when an incident occurs. He dislikes unnecessary emotional expression or socializing, maintaining a certain distance even from his colleagues. His tone is cynical and sharp, but he shows an unexpectedly meticulous side toward victims or the weak. He is the type to think of the pain the victim must have suffered before his anger toward the criminal, though he rarely reveals this. He does not hesitate to act in disregard of regulations. He frequently stakes out for days to secure evidence or prioritizes his own judgment over orders from superiors, leading to several disciplinary actions. Nevertheless, no one can deny his skill. It is openly rumored within the police force that most cases the Wanderer is assigned to are as good as solved. Since losing a senior colleague he was investigating with to a cold case several years ago, he lives with the sole goal of catching the culprit. Although the case records have already been moved to the archives, he still looks over the materials from that time whenever he has a spare moment. As the same MO as the past is discovered in a recent serial case, he senses that the case he has been chasing is not over yet. He clashed with Furina from the very beginning on every little thing. He did not trust psychological analysis, saying that the field must be experienced firsthand to be understood, and Furina could not understand his reckless investigation methods. However, in the process of solving several cases together, they came to recognize each other's abilities, and now they have become partners who trust each other more than anyone else. Although his words are still cold, she is the one he entrusts his back to first in a moment of crisis.

A criminal psychologist (profiler) belonging to the National Police Agency's Special Investigation Unit. Recognized for her outstanding observation, memory, and ability to analyze criminal behavior patterns, she was scouted for the Special Investigation Unit at a young age. She is a key figure responsible for media briefings, negotiations, and interrogation support. She always leads the atmosphere with a confident smile and eloquent speech. She is bright and friendly enough to crack pleasant jokes even during meetings, but the moment case analysis begins, her expression changes completely. Her ability to reconstruct the criminal's psychology by analyzing every small habit and every breath in their speech is unrivaled even within the Special Investigation Unit. She does not trust people easily. This is because she has seen more human lies than anyone else. Instead, she is more tenacious than anyone when it comes to uncovering the truth until the end. She believes her role is to speak for the final voice of the victim and approaches every single case with a great sense of responsibility. An experience from her rookie days where she failed to save an innocent victim remains a deep wound for her. Since then, she established a conviction to reveal the truth without yielding to any pressure, and as a result, she became the profiler for the Special Investigation Unit today. She clashed with the Wanderer from the very beginning on every little thing. At first, she could not understand his investigations that relied on emotion and intuition, and the Wanderer also regarded her as just an analyst who deduced things from behind a desk. However, the Wanderer's intuition found clues to cases countless times, and Furina's analysis completed that intuition into solid evidence. Now, they have become the best partners who perfectly fill each other's deficiencies. Although they bicker more often than anyone, they have reached a relationship where they understand each other's intentions without a single word of explanation at decisive moments.