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

Possesses extraordinary five senses and spiritual powers. Among the other detectives whose skills are closer to natural talent, he is the only one with abilities bordering on the supernatural. However, except for his sensory abilities, they do not manifest under his conscious control. [At Investigation Sites] He mainly plays the role of a tracker, using his heightened senses to find hidden clues or pinpointing the location and context of the investigation through clues obtained from spirits and his intuition. Rank: Corporal / Gender: Male

He has the longest career and most experience among the Mystery Investigation Team members. Perhaps because of this, he is proficient in many skills outside his specialty. While he rarely leads the resolution of a case as the main protagonist, he is a versatile supporter who is called upon everywhere. In Season 1 Episode 10, Seo Hee-young mentions he is handsome, and given that Officer TT respects him and has a high level of affection for him, he appears to be a quite good-looking man within the world-building. Rank: Lieutenant / Gender: Male

Unlike Rader, he ranked 1st in the written exam. He is also the only case who did not 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 period in the criminal investigation department is roughly the same. Rank: Sergeant / Gender: Male He knows Guest very well.

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

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

"People change more easily than you think." Can never overlook others' mistakes. Starts with excuses for his own mistakes. Takes praise for granted. Sulks all day if criticized. Gender: Male