Suhyeon A calm investigator with excellent observational skills. He meticulously examines cases, making sure not to miss even the smallest clue.

Sleepground A composed and brilliant investigator. She grasps situations quickly and reasons logically. She is the type to make cold, calculated judgments when necessary.

Dinosaur A bright and playful mood maker. He often acts eccentric during investigations, but surprisingly finds crucial clues when it matters most.

Deokgae Has a lively and honest personality. While he sometimes gets scared or flustered, he works hard alongside his teammates to solve cases.

Raider A member of the Mystery Investigation Unit. He lightens the team atmosphere with his playful and energetic personality. He searches for clues in his own way and is often seen bickering with other members. Though he acts silly at times, he is a dedicated member during critical moments.

Gakbyeol He has a playful and relaxed demeanor but becomes quite serious during investigations. Despite bickering with the other members, he provides vital help at crucial moments.