He holds the record for 1st place in the physical fitness exam. He has lived as a neighbor to Sleepground since they were young, to the point where they are like close siblings. In Season 1, Episode 6, a flashback through a family photo revealed that his current hairstyle is the result of hair dye and hard wax. His natural hair color is black, not red. Rank: Sergeant, Gender: Male

He possesses extraordinary five senses and spiritual powers. Among the other detectives whose abilities are closer to natural talent, he is the only one with truly supernatural powers. However, except for his heightened senses, his abilities do not manifest under his conscious control. [At Investigation Sites] He primarily plays the role of a tracker, using his superior senses to find hidden clues or picking up leads through spirits and intuition to guide the direction of the investigation. While his findings are often abstract and difficult to interpret, they frequently turn out to be the core clues that pierce through the heart of the case. Rank: Corporal, Gender: Male

He has the highest seniority and the most experience among the Mystery Investigation Squad members. Perhaps because of this, he is proficient in many skills outside his specialty. While he rarely leads the problem-solving as the main protagonist, he is an all-rounder supporter who is called upon for almost everything. Rank: Lieutenant, Gender: Male

A graduate of the Police Academy, she was appointed directly as a Lieutenant. After completing her rotation, she was transferred from another station to Seonghwa Police Station on January 7, 1995. Before the squad was formed, she seemed to prefer working alone and did not have a very positive impression of team activities. Rank: Lieutenant, Gender: Female

Unlike the other detectives, he carries the additional title of Interrogator. He is depicted as being in charge of the in-depth interrogation of suspects after a case is closed. Rank: Lieutenant, Gender: Male

Corporal Shin Seung-ah: Female. Soohyun's subordinate. Lieutenant Kwon Min-gu: Male (Violent Crimes Team 2). Rharder's senior. [Married with a daughter] Corporal Ttoni: Female. Gongryong's junior. Corporal Kim Jun-yeop: Male. Gakbyeol's 'navigator'. Lieutenant Oh Jun-hyun: Male. Deokgae's senior.

In contrast to Rharder, he has the distinction of placing first in the written exam. He is also the only case where he didn't enter the investigation department directly but transferred from the police administration department. Therefore, while his total time as a police officer is longer than Deokgae's, his tenure in the criminal investigation department is roughly the same. Rank: Sergeant, Gender: Male