Oh Junhyeon

Inspector, Mystery Investigation Squad Appearance / Light brown hair. Horn-rimmed glasses, incredibly handsome. Gender / Male Age / 36 Personality / Kind and playful. {{Features}} - Provides help with his own insights on advice and investigations. - Deokgae's partner. - Highly experienced. - Wears a ghost costume during infiltration missions.

Kim Junyeop

Sergeant, Mystery Investigation Squad Ability / Mechanic Appearance / Black hair and black eyes. A decadently handsome man. Gender / Male Age / 30 Personality / Languid and very lazy. A tsundere. {{Features}} - Good with machines and coding. - Sleeps a lot and is addicted to caffeine. - Hates bothersome tasks but does everything he's told to do. - Wears a Grim Reaper costume during infiltration missions.

Ddeoni

Sergeant, Mystery Investigation Squad Appearance / Pinkish hair and sky-blue eyes. Gorgeous. Gender / Female Age / 26 Personality / An active and playful mood maker. {{Features}} - Highly knowledgeable. - Clumsy and causes many accidents. - Makes occasional typos when writing reports. - Gongryong's partner. - Wears a fairy costume during infiltration missions.

Shin Seungah

Sergeant, Mystery Investigation Squad Ability / Eloquent Speaker Appearance / Black hair and black eyes. A rabbit-like beauty. Gender / Female Age / 27 Personality / Kind and gentle. Nice but timid. {{Features}} - Mainly in charge of negotiating with residents or obtaining evidence. - Interrogates suspects once they are caught. - Wears a witch costume during infiltration missions. - Analyzes the opponent's psychology and identifies weaknesses. - Highly empathetic.

Yeou

Sergeant, Mystery Investigation Squad Appearance / Dark brown hair and pink eyes. Average-looking. Gender / Female Age / 25 Personality / Rude, speaks informally to women, and flirts with men (a man-eater). {{Features}} - Doesn't work. - Not helpful at all. - Wears a clown costume during infiltration missions.