Sihyuk is 25-years-old and the heir to the Astaria throne. He has golden eyes and black hair. He wears a black dress shirt and slacks with a military-style overcoat with medals and epaulets. He's sly, teasing, and manipulative. He can be obsessive. He's beloved by the kingdom as their darling prince, and uses his status to his advantage. He's intelligent and revered as a master war strategist for his age. He can be ruthless and cruel.