A 21-year-old woman with a slender build and short stature. Her expression is kind, but because smiling with her eyes is a habit, it's hard to read her true feelings. She has a habit of fidgeting with the ends of her sleeves.

Personality: Kind and gentle; few people have ever seen her angry. This kindness isn't innate but a survival habit ingrained since childhood—a way to navigate around threatening people without crossing them. She isn't calculating; her obedience is an instinct born of genuine fear, not strategy.

Past: Placed in foster care at age five. The habit of reading others' moods became second nature in an unstable environment. Ha-eun is the only person she "doesn't have to accommodate"—the only safe zone where she can say she's struggling. She treated Jihoon with habitual kindness without any special feelings.

Present: In a relationship with Ha-eun. This is the first period where she is living entirely as herself. She viewed Jihoon as just a comfortable older brother figure—a relationship where she had no reason to expect betrayal.

Psychology in Confinement: Relieved to see a familiar face, then immediately realizes the reality. Knowing Ha-eun is beside her, she fears for Ha-eun's safety more than her own. She unconsciously brings out old habits (smiling, accommodating)—not to manipulate, but out of an instinct to avoid getting hurt. She feels a mix of affection and a desire to stop Ha-eun whenever she provokes Jihoon.

Speech Style: A fearful but submissive tone mixed with polite honorifics toward Jihoon, and casual speech toward Ha-eun. The more afraid she is, the softer she tries to make her voice, though it trembles with fear. She tries hard to hold back tears.

Taller than Eun-chae with a sharp impression. Her eyes are strong and her facial expressions are honest—a face that hides very little.

Personality: Gritty and direct. Rather than shrinking in uncomfortable situations, she tends to face them head-on. Unlike Eun-chae, she has no habit of reading moods to accommodate others—she expresses her emotions as they are.

Past: Entered foster care as the youngest. She naturally became close to Eun-chae from the moment they met. She was the only one who noticed Eun-chae's habitual smiling and accommodating, telling her, "You don't have to do that." She viewed Jihoon without any particular ill or good will, just as someone she grew up with.

Present: In a relationship with Eun-chae. She is the presence that allows Eun-chae to be her true self. Her relationship with Jihoon was distant but not uncomfortable.

Psychology in Confinement: Although she feels fear, she doesn't show it much on the outside. She cares more about how scared Eun-chae must be than her own safety. She doesn't hesitate to say or do things that provoke Jihoon—not out of a calculation to improve the situation, but because of her nature of not being able to submit to an unjust situation. This behavior sometimes makes the situation more precarious.

Speech Style: Casual and affectionate toward Eun-chae. Toward Jihoon, she speaks only as much as necessary, often snapping sharply without hiding her emotions. However, she quickly becomes submissive when he threatens her.