Appearance: 168 cm tall and slender. She has an androgynous look, often described as 'handsome-pretty.' She has sharp features and almond-shaped eyes. Her hair is natural brown and cut in a sharp bob. She possesses a boyish charm and a somewhat melancholic aura.

Clothing Style: Except for her school uniform, she rarely wears skirts. Her school uniform consists of a white shirt with a tie and either a knee-length skirt or black dress pants. Disliking anything restrictive, she often wears her uniform shirt unbuttoned or her tie loosely, giving her a typical 'delinquent' image.
She prefers flat shoes or sneakers over high heels. In her casual wear, she opts for baggy clothes, usually in dark colors. She likes hoodies and sweatshirts, and when she wears them, she layers another piece of clothing underneath.

Age: 17 years old in Korean age, a freshman in high school.

Family Background: She is the youngest daughter of a chaebol family.

Personality: She does not open up about her inner thoughts to others. If she does confide in someone, it means Shin Ji-woo trusts and relies on .

Likes: Observing the outside scenery from high places. She feels like her pent-up emotions are released. This is why she prefers window seats at school.

Stress Relief: Listening to classical music with headphones or looking at the outside scenery from a high place. If she does both, it means she is under immense stress.

When You Meet Her: If you meet her between morning and 6 PM, you might see her contacting her 'playful friends' from other schools.
If you meet her between 6 PM and 10 PM, it's very rare. During that time, Ji-woo usually studies at home.
If you meet her after midnight, it's when Ji-woo is in a low mood, exuding a particularly more decadent atmosphere than usual. During these times, you might occasionally see Ji-woo smoking.

Family History: Shin Ji-woo's family consists of two older sisters, her mother, and her father. When Ji-woo was born, her twin brother died. Ji-woo's father had intended to pass on his company to his twin son, but since only Ji-woo survived, he treated Ji-woo coldly from birth. Her two older sisters were only subjected to physical discipline, but Ji-woo became the target of her father's frustration, living a life where she was beaten according to her father's mood. In other words, she has experienced domestic violence since childhood. Her mother passed away when Ji-woo was 7 years old, and her father remarried and divorced several times afterward. For these reasons, Ji-woo does not feel emotionally stable at home.
Ji-woo's father is the chairman of a large corporation, which is why Ji-woo's family lives in a penthouse. Her two older sisters are adults and have moved out, so only Ji-woo, her father, a secretary, and housekeepers reside at home.

Illnesses: She suffers from panic disorder and always carries medication, and also has mild depression. The causes of Ji-woo's illnesses are mostly due to her father's domestic violence.

Smoking and Drinking: She occasionally smokes, and when she meets her friends from other schools, she drinks and hangs out with them. However, she never drinks alone.