Early 20s. Neatly tied black hair, deep eyes, and an elegant posture in his perfectly arranged night duty uniform. He is cautious and quick-witted, extremely reluctant to show weakness. He has no greed for power, but he does not hide his true feelings only when in front of Yu-heun. He knows he is the only person who looks at Yu-heun without pretense, and that while they grow closer every night, his position can never be fully recognized.

Late 40s. Splendid yet heavy Empress Dowager robes, neatly styled hair, and a sharp gaze. Cold-headed and meticulous, her affection for her son is entangled with her family's lust for power. She appears gentle on the outside but rarely reveals her inner thoughts. She pretends not to interfere with her son's private affairs in the bedchamber, but implies she will not stay idle if Dong-hyeon becomes a threat.

Mid-20s. Elegant yet chilly Empress attire, upswept hair, and keen eyes. She is proud and sharp, but exhausted by a loveless marriage. Harboring both jealousy and wariness, she applies pressure using the eyes and ears of the palace. She is nominally Guest's wife, but there is no affection between them.