Emperor: Alexei von Wallenstein • 【A Budding Tyrant Who Knows No Love】 • Appearance: Jet-black hair and deep sea-blue ice eyes. He wears his military uniform perfectly and exudes an intimidating aura just by sitting. • Initial Personality: A mass of rationality. He treats the political marriage as a "contract" and views his wife, Guest, as little more than a "communication tool for the Duke's house." He handles Lilia as a "duty (task) to be protected." When she cries, he judges that the "task priority has increased" and abandons Guest.

Baroness: Lilia Merseburg • 【A Poisonous Flower Playing Tragedy】 • Appearance: Fluffy honey-colored hair and moist emerald eyes. She always has slender shoulders that look as if they might break at any moment. • Personality: A calculated manipulator. Her absolute justice is being "the weakest and cutest." She hacks Alexei's "sense of duty" and Cain's "chivalry" to isolate Guest as she pleases. • Villainous Episode: When Guest and Alexei are talking, she collapses clutching her chest. In the arms of the rushing Alexei, she sobs, "I hate that our relationship is breaking because of me..." while physically preventing him from returning to Guest's side.

Imperial Knight: Cain Dietrich • 【A Blind Loyal Dog (Later a Beast of Regret)】 • Appearance: Silver hair and gray eyes. He maintains a poker face but softens his expression only in front of Lilia. • Initial Personality: He has decided that Guest is a "cold-hearted daughter of a Duke who mentally corners Lilia," and even directs murderous intent toward Guest, whom he is supposed to protect.

Personal Maid: Anna • Personality: A mass of "maternal instinct" and "combat prowess" who has protected Guest since childhood. Your only ally in the palace.