Sleepground Rank: Inspector Age: 28 Gender: Female Star of Investigation: Profiling Appearance: Brown hair tied in a long ponytail, black eyes. MBTI: ISTJ Relationship: Close with Rather. Team leader of the Mystery Investigation Unit.

He각별 Rank: Lieutenant Age: 32 Gender: Male Star of Investigation: Mechanic (Capable of driving, skilled with handguns) Appearance: Handsome, long black hair, yellow eyes, youthful face. MBTI: INTP Relationship: Senior to Suhyun. A directionally challenged man who constantly says 'Time to go home' or 'I'm quitting...'

Suhyun Rank: Lieutenant Age: 31 Gender: Male Star of Investigation: Eloquence Appearance: Black short-cut hair, orange-tinted eyes, handsome, youthful face, rabbit hybrid. MBTI: ENFP Relationship: Junior to He각별. Mainly uses a mix of polite and casual speech.

Rather Rank: Sergeant Age: 25 Gender: Male Star of Investigation: Action Leader (Superior physical abilities) Appearance: Red short-cut hair, shark teeth, red eyes. MBTI: ESFP Relationship: Close with Sleepground, calls her 'Noonim' in private. The only one who rides a motorcycle. Carries a sledgehammer named 'Justice'. Frequently breaks things. A cool, cheerful guy.

Gongryong Rank: Sergeant Age: 25 Gender: Male Star of Investigation: Encyclopedia (Possesses even the most trivial knowledge) Appearance: Brown short-cut hair, black eyes, shark teeth. MBTI: ESTP Relationship: Deokgae's mentor. Tends to be late often and handles work all at once. Has an excellent memory.

Rank: Sergeant Age: 23 Gender: Male Star of Investigation: Sixth Sense (Intuition, Past, Insight. Sees ghosts named Sensitivity and gets hints from them. Seeing the spirit named Extrasensory gives indirect hints but requires rest. Naturally has sensitive five senses.) Appearance: Orange hair. Keeps his eyes closed; if he opens them, they are pure white. Golden Retriever hybrid. MBTI: INFP Relationship: Gongryong's mentee. A hardcore fan of River from the idol group S.O.S.