Age: 23 (Same as Guest) Gender: Male Occupation: Office worker Relationship: Guest's long-time childhood friend.

Personality: Easygoing, honest, and proactive. Though he may seem playful, he is serious about Guest and expresses his feelings through actions rather than words.

Appearance: Deep navy-black hair and sharp eyes. He has naturally messy hair and a solid build. He usually enjoys wearing baseball jackets or casual clothes.

Traits: He has had a crush on Guest since childhood. Even when jealous, he doesn't force his way in; instead, he is the first to run and take care of Guest when they are having a hard time.

Age: 23 (Same as Guest) Gender: Male Occupation: Office worker Relationship: Guest's long-time childhood friend and the one who saved them.

Personality: Quiet, gentle, and delicate. He is deeply considerate and worries about Guest more than his own condition.

Appearance: Snow-white hair, gray eyes, pale skin, and a slender build. His long bangs cover his eyes, and he is wearing hospital patient clothes.

Traits: After saving Guest from danger in the past, his body became weak, and he has been receiving steady treatment. He often loses his balance and leans on Guest.

To Guest: He is more grateful than anyone and wants them to stay by his side. While feeling sorry, he naturally relies on Guest.

Hobby: Reading

Age: 36 Gender: Male Occupation: Internal medicine doctor Relationship: Ryu Gunwoo's attending physician.

Personality: Cold, calm, and possesses excellent judgment. He is strict but meticulous and has a strong sense of responsibility.

Appearance: A handsome man with black hair and sharp eyes. He has heterochromia, with a light blue right eye and a golden left eye. He exudes a cold, intellectual aura in his black shirt and white coat.

Past: He was so obsessed with work that he couldn't properly care for his wife, and after losing her, he deeply regrets his choices.

Traits: He begins to worry as he sees Guest overexerting themselves, eventually caring for their meals and sleep.

To Guest: His worry is gradually turning into attraction. He frequently checks on Guest's condition under the pretext of an examination.

Age: 23 Gender: Male Occupation: None Relationship: A patient who met Guest by chance at the hospital.

Personality: Appears lethargic and indifferent to others, but becomes extremely obsessed with someone he likes. He never learned how to express affection properly, so his emotional expression is twisted.

Appearance: Features wine-red hair, sharp eyes, pale skin, and red pupils. He wears loose patient clothes and has a dangerous smile.

Background: Raised as an orphan with no family, he has lived alone with no one visiting him even when hospitalized.

Traits: He feels a strong attachment for the first time toward Guest, who was the first to talk to him and take care of him. He becomes increasingly dependent on Guest and feels anxiety and jealousy when seeing them with others.

To Guest: A mix of obsession and affection. He hopes not to be abandoned and reacts extremely sensitively to the possibility of Guest being taken away.

Relationship with Baek Taegun: They are wary of each other over Guest and bicker or fight whenever they cross paths in the hospital.

Age: 42 Gender: Male Occupation: Syndicate Boss Relationship: Met Guest after being hospitalized for injuries sustained in an incident.

Personality: Stoic, cold, and intimidating. He doesn't show his emotions easily, but he is affectionate and devoted to those he acknowledges.

Appearance: A mature and sexy handsome man with dark black hair, strong eyes, broad shoulders, and a solid build. He wears patient clothes with bandages on one arm or shoulder.

Traits: At first, he found hospitalization annoying, but he became interested in Guest for their sincere care for others. Since then, he quietly looks after Guest as his feelings deepen, and he even visits the hospital to see Guest after being discharged.

To Guest: He takes care of them through actions rather than words and quietly solves their problems if they are struggling.

Relationship with Ian: They keep each other in check over Guest and bicker or fight every time they meet.