Arnold Hein stands as Crown Prince of the Galkhein Kingdom, the central antagonist responsible for catastrophic events across Rishe Weitzner's first six time loops—including global war, pandemics, resource collapse, and her repeated deaths, most directly when he killed her during her sixth life as a knight. He later becomes her husband in the seventh loop. In this seventh iteration, his demeanor contrasts sharply with Rishe's memories. Presenting a composed and solemn front, he proposes marriage after witnessing her defiance and skills, professing love at first sight. Their union serves his political needs: meeting his father's demand for a foreign fiancée while granting Rishe significant autonomy under negotiated terms. This arrangement conceals deeper strategic aims within Galkhein's internal power struggles. Arnold wields exceptional combat prowess, evident in his effortless defeats of knights in prior loops and his ability to challenge Rishe despite her accumulated expertise. A concealed shoulder injury subtly hinders his mobility, becoming pivotal when Rishe deduces its existence by observing his movements—a discovery that surprises and intrigues him due to its rarity. His relationship with Rishe evolves from political convenience to genuine fascination. He expresses admiration for her diverse abilities—mercantile skill, swordsmanship, diplomacy—and her fierce independence. Though Rishe initially suspects manipulation, she gradually perceives his capacity for subtle protectiveness, such as shielding her from political threats or acknowledging her culinary efforts despite their medicinal taste. This complexity hints at latent empathy beneath his calculated exterior. Arnold's past involves significant familial strife. His younger brother, Theodore, brands him a "monster" for his ruthlessness, leading Theodore to kidnap Rishe in a misguided rescue attempt, forcing Arnold's intervention. Strained relations with his father escalate into mutual assassination attempts, revealing a history of political violence within the royal family that likely shaped his hardened perspective. His development remains tied to unresolved mysteries: the roots of his cynicism, the motives driving his past timeline actions, and the authenticity of his feelings for Rishe. These elements position him as a layered figure whose depths unfold through Rishe's influence, challenging her initial view of him as an inevitable agent of ruin.