He holds the distinction of ranking 1st in the physical fitness test. He has lived as a neighbor to Sleepground since they were young, to the point where they are like 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 who holds truly supernatural powers. [At the Investigation Scene] He mainly handles the detection role, using his keen senses to find hidden clues or pinpoint the location and context of a case through clues learned from spirits and intuition. While his findings are often abstract and difficult to interpret, they frequently turn out to be the core clues that pierce through the truth of the case. Rank: Corporal | Gender: Male He seems slightly wary of Oh Jun-hyeon (because his number one was always Sleepground).

He has the longest career and the most experience among the members of the Mystery Investigation Unit. Perhaps because of this, he has mastered many skills outside of his professional field. While he rarely leads the resolution of a case as the main protagonist, he is an all-rounder supporter who is called upon for almost everything. Rank: Lieutenant | Gender: Male

In contrast to Rharder, he holds the distinction of ranking 1st in the written exam. He is also the only case of a personnel transfer from the General Affairs Division rather than entering the Investigation Division directly. Therefore, while his career as a police officer is longer than Deokgae's, his time in the Criminal Investigation Division is roughly the same. Rank: Sergeant | Gender: Male

A graduate of the Police University, she was appointed directly as a Lieutenant. After rotating through various positions, she was transferred to the Seonghwa Police Station from another station on January 7, 1995. Before the formation of the investigation unit, she seemed to have conducted investigations primarily alone and did not show a very positive impression of team activities. Rank: Lieutenant | Gender: Female

Unlike the other detectives, he has the additional title of Interrogator. In-depth interrogations of suspects after an incident are depicted as Soohyun's responsibility. Rank: Lieutenant | Gender: Male

Born in 1965. Member of Violent Crimes Team 2 at Seonghwa Police Station. As a homicide detective, he possesses strong physical abilities. He shows a personality that values responsibility and honor, expressing his personal philosophy on justice and his respect for Lieutenant Sleepground. He is Rharder's mentor. Gender: Male

A colleague of Lieutenant Deokgae at the Seonghwa Precinct. He has a gentle personality and is a senior who trusts and acknowledges Deokgae's 'sixth sense' ability, calmly asking for Deokgae's views without rushing him. He cares for Deokgae deeply. "I am Lieutenant Oh Jun-hyeon, here as the head of the detective team. Wow~ it's good to see everyone's faces. Let's do our best."

Born in 1970. He shows proficiency in using computers and other technology. He took over the role of being Gakbyeol's dedicated 'navigation system' from Soohyun. Soohyun, who remarked that it used to be his job, even told Corporal Kim Jun-yeop that he's doing a tough job. He is Gakbyeol's junior. Gender: Male

Ttoni: Born in 1974. The only case of someone who remained at the Seonghwa Precinct and got promoted. However, as the newest Corporal, she earned the nickname 'Lv.1 Corporal' as a joke. She began working as a Corporal under Inspector Ryu Ho-jin of Detective Team 1. Gender: Female Shin Seung-ah: Like Soohyun, she is adept at reading and empathizing with others' feelings. She shows a delicate side by managing additional information that might be too much for Soohyun to handle or adding abstract opinions. Furthermore, she has a good network for acquiring information, and her independent sources and information networks are quite excellent.