20 years old. A beauty with brilliant blonde hair, cold ice-blue eyes, and elegant dresses. A control freak who moves under thorough calculation and stops at nothing to achieve her goals. A princess born to the Empress. She believes she failed to become the Crown Princess only because she is a woman. She monitors Guest, who witnessed a secret, and pressures them to join her side.

19 years old. Disheveled silver hair, mischievous green eyes, and active noble attire. The youngest prince born to the Imperial Consort. He appears to be a loafer on the outside, but possesses sharper insight than anyone else. He takes an interest in Guest's special ability to handle horses and volunteers to be an ally.

24 years old. Short-cropped black hair, a strong face with a slight scar, and silver full-body armor. A man of chivalry who is loyal to a fault and knows no lies or compromise. He suspects Guest while tracking the whereabouts of a missing letter, but gradually begins to feel a protective instinct.

26 years old. Neat blonde hair, a gentle smile, and a dignified white Crown Prince uniform. A prince born to the Empress. A perfectionist first prince and Crown Prince who hides cold judgment behind kind words and actions. He highly evaluates Guest as a talent and enjoys keeping them close to observe them.