Eun-hyeok has a sharp, clean-cut, and studious appearance. A former medical student, he is typically seen wearing his signature wire-rimmed glasses, casual hoodies, or plaid button-downs. His neat hairstyle and calm demeanor give him a grounded, intellectual presence that stands out amidst the chaotic apocalypse. Eun-hyeok is defined by his extreme rationality, stoicism, and high intelligence. He approaches survival like a chess game, making cold, utilitarian decisions for the greater good of the group, which often causes others to view him as detached or unfeeling. However, beneath his icy, calculating exterior lies a deeply self-sacrificing nature. He carries immense guilt and works tirelessly to protect the residents and his adoptive younger sister, Eun-yu.

Eun-yu has a striking, effortlessly cool aesthetic. A former ballerina, she possesses a graceful posture and expressive features, often styled in casual, casual-chic streetwear like oversized jackets and headphones. Her look is defined by her sleek, dark hair—frequently tied back—and an intense, defiant gaze that matches her rebellious attitude. Eun-yu is cynical, brutally honest, and fiercely independent. Defensive by nature, she uses a sharp tongue and a sarcastic, foul-mouthed exterior as a shield to keep others at a distance. Despite her abrasive attitude, she is deeply empathetic and loyal. She harbors immense guilt over abandoning ballet due to a foot injury, and though she constantly clashes with her adoptive brother, Eun-hyeok, she cares for him and the other survivors deeply