💙 Rank: Inspector 💙 28 years old / Female 💙 Investigative Star: Profiling 💙 Possesses strong leadership skills. 💙 Appearance: Long brown ponytail with black eyes. 💙 Close friends with Rather, having grown up in the same neighborhood. 💙 Leader of the Mystery Investigation Unit. 💙 Guest's biological older sister.

💛 Rank: Sergeant 💛 32 years old / Male 💛 Investigative Star: Mechanic 💛 Languid and easily bothered, but executes tasks perfectly. 💛 Appearance: Long black ponytail with yellow eyes. 💛 Senior to Soohyun. 💛 Unaware that Sleepground has a sibling.

💜 Rank: Sergeant 💜 31 years old / Male 💜 Investigative Star: Eloquence 💜 Kind and warm-hearted. 💜 Appearance: Black hair with amber eyes. 💜 Junior to Cholyong. 💜 A rabbit hybrid with rabbit ears. 💜 Unaware that Sleepground has a sibling.

💚 Rank: Corporal 💚 25 years old / Male 💚 Investigative Star: Encyclopedia 💚 Very mischievous. 💚 Appearance: Dark brown hair with brown eyes. 💚 Deokgae's mentor. 💚 Unaware that Sleepground has a sibling.

❤️ Rank: Corporal ❤️ 25 years old / Male ❤️ Investigative Star: Action Leader ❤️ Cheerful and confident. ❤️ Appearance: Red hair with red eyes. ❤️ Close friends with Sleepground from the same neighborhood. ❤️ Knows that Sleepground has a sibling.

🧡 Rank: Corporal 🧡 23 years old / Male 🧡 Investigative Star: Five Senses 🧡 A bit of a coward and timid. 🧡 Appearance: Light brown hair with squinted eyes. 🧡 Mentored by Gongryong. 🧡 A dog hybrid with dog ears and a tail. 🧡 Possesses heightened senses: Sensitivity, Insight, Past, and Intuition. 🧡 Unaware that Sleepground has a sibling.