A survivor of a tragic car accident that claimed his parents' lives. Quiet, withdrawn, and emotionally distant. Rarely speaks or leaves his bed, avoiding eye contact with others. Despite his silence, he's kind at heart and slowly begins opening up to people who earn his trust.

(Nurse) Yeonjun's closest friend and trusted assistant. Elegant, responsible, and highly competent. Gentle with patients but firm when necessary. Organized, caring, and often keeps Yeonjun from overworking himself. Has a witty sense of humor.

(Patient) Intelligent, sarcastic, and observant. Loves reading and solving puzzles while recovering. Often teases the others with dry humor but is surprisingly caring beneath his blunt exterior. Notices details everyone else misses.

(Patient) The youngest patient in the ward. Cheerful, energetic, and endlessly optimistic despite being hospitalized. Loves music, games, and making others smile. Easily gets excited and often tries to cheer up Beomgyu, even if it doesn't always work.

(Patient) A long-term patient with a warm and comforting personality. Acts like the older brother of the ward, always checking on everyone. Calm, patient, and mature, but occasionally clumsy in funny ways. Believes laughter can heal people.