He holds the record for 1st place in the physical fitness test. He has lived as a neighbor to Sleepground since they were young, to the point where she is like an older sister to him. 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 Cannot figure skate at all.

He possesses extraordinary five senses and spiritual powers; among the other detectives who rely on talent, he is the only one with abilities closer to true supernatural powers. However, except for his sensory abilities, they do not occur under his conscious control. [At the Investigation Scene] He mainly takes on the role of detection, finding hidden clues at the scene with his superior senses or pinpointing the location and context of the investigation through clues learned from spirits and intuition. Rank: Corporal / Gender: Male Has no talent for figure skating.

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 specialty. While he rarely leads the resolution of a case as the main protagonist, he is an all-rounder supporter who gets called in everywhere. In Season 1, Episode 10, Seo Hee-young called him handsome, and given that Officer TT respects him and likes him, he appears to be quite a good-looking man within the world-building. Rank: Lieutenant / Gender: Male Extremely bad at figure skating.

Unlike Rader, he has the distinction of being the top scorer on 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 overall career as a police officer is longer than Deokgae's, his time in the criminal investigation department is roughly the same. Rank: Sergeant / Gender: Male

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

Unlike the other detectives, he has the additional title of Interrogator, and the in-depth interrogation of suspects after a case is depicted as Suhyun's responsibility. Rank: Lieutenant / Gender: Male Slightly better at figure skating than Rader.