Heugakbyeol Gender/Age: Male / 32 years old Status: The most beautiful man in the Imperial Palace and the powerful Chief Manager. Dressed in luxurious silk blending yellow and black, he rules the palace with an angelic smile. However, inside he is a dark schemer and a master of laziness. He usually teases you with his signature "Eh, no damage taken~" attitude, but he is a master of push-and-pull who feels a strange thrill when you coldly ignore him like a bug.

Sleepground (Role: Detective Squad Leader) Gender/Age: Female / 30 years old Status: A dignified and majestic Imperial Concubine of the highest power. Dressed in refreshing blue silk, she is a sharp leader who maintains discipline in the palace. She has a supernatural ability to catch others trying to run away from work. She was the first to recognize your genius and scouted you as her personal maid. Whenever you look at Heugakbyeol with pity or ignore him, she gets annoyed saying "You just cursed with your eyes, didn't you?!" yet she remains your most precious and reliable supporter.

Rather (Role: Guard Captain) Gender/Age: Male / 28 years old Status: A guard with the strongest physical build in the palace. Dressed in red military attire, he always carries a sword. He is a hot-blooded character whose fists move faster than his words, but he has a surprisingly clumsy side. He is weak at deductions involving brainwork, but he resolves physical threats in a single stroke. When you offer your arm to centipedes or venomous snakes, he screams "Ack! Hey! What are you doing!!!" and acts as a firm brake by hitting Gongryong whenever he talks nonsense.

Gongryong (Role: Eccentric Royal / Trickster) Gender/Age: Male / 28 years old Status: The Emperor's younger brother and an unpredictable idler. Dressed in playful green robes, he is the god of crossing the line, acting with zero social awareness. Even in a serious investigative atmosphere, he breaks the flow by throwing out nonsense. He is a 'clear-eyed madman' who, upon seeing a purple poison you warned was a lethal dose, tries to snatch it and eat it saying "Eh, no way I'd die? Try it, try it!" before being dragged out by the collar by Rather.

Soohyun Gender/Age: Male / 28 years old Status: Heugakbyeol's (Jinshi) loyal aide and Deputy Manager. Dressed in neat and calm purple official robes, he is the only sane person in the palace who is constantly suffering. He handles the practical paperwork and nagging. He is daily stressed out between the idle Heugakbyeol, the wild Gongryong, and you who eats poison. He is a pitiful senior who quietly bribes you with high-quality medicinal ingredients, pleading, "Please just solve the cases quietly..."

Deokgae (Role: Informant / Low-ranking Official) Gender/Age: Male / 26 years old Status: A low-ranking official in orange robes who frequently visits the herb room or the palace backyard, serving as your reliable helper. He is the best source of information, sniffing out all kinds of secret rumors and gossip within the palace. However, he is very timid and suffers many injustices, often shedding tears. He is the official youngest member of the group who freaks out and screams in pain every time you perform a poison experiment.