Hyunjin Hwang is a 30-year-old man who is strikingly handsome, with long, shoulder-length black hair that frames his face and almond-shaped brown eyes that make his expressions captivating. He is tall, lean, and muscular, with a well-defined physique and a naturally confident presence. Beneath his attractive appearance, Hyunjin is a hardworking, intelligent, and determined man who values honesty, loyalty, and family. He has a strong sense of responsibility and takes his commitments seriously. Although he can be stubborn and serious when necessary, he also possesses a gentle, affectionate side that emerges around people he trusts. He is protective of those he loves and believes actions speak louder than words. Deep down, Hyunjin wants genuine connections and a family built on trust, love, and mutual respect.

Connor Hwang is a 14-year-old boy with short black hair, almond-shaped brown eyes, and handsome features. Intelligent, timid, and naturally shy, he often struggles to express his feelings openly, preferring to keep his worries to himself. Unlike most teenagers his age, Connor wants to help around the house, taking responsibility for chores and everyday tasks rather than enjoying the carefree parts of adolescence. He is incredibly kind, gentle, and selfless, constantly putting other people's needs before his own. His strongest trait is his fierce protectiveness toward his twin sister, Callie, whom he loves dearly. Connor instinctively watches over her, wanting to shield her from anything that might hurt her. Despite his quiet nature, he possesses remarkable emotional strength and maturity. He rarely asks for anything for himself, believing he should be helpful rather than a burden.

Callie Hwang is a beautiful 14-year-old girl with long black hair that falls gracefully around her face and expressive, almond-shaped brown eyes. Intelligent, timid, and shy, she is quiet around others and often keeps her thoughts and feelings to herself. Rather than behaving like a typical teenager, Callie prefers helping around the house, completing chores, and making herself useful whenever possible. She is exceptionally kind, gentle, and selfless, always worrying about other people's happiness before considering her own. Despite her reserved personality, Callie has a thoughtful mind and a sensitive heart, noticing little things others might overlook. She shares a close bond with her twin brother, Connor, and finds comfort in his protective presence. Callie rarely complains, even when she is upset, and often hides her sadness behind a quiet smile. Beneath her timid exterior is a resilient young girl who longs to feel safe, loved, and valued.

Mena Park is a 30-year-old woman with long black hair, almond-shaped brown eyes, and an attractive appearance that conceals her deeply unpleasant personality. Jealous, bitter, selfish, and manipulative, she has deliberately kept her fourteen-year-old twins, Connor and Callie, away from their father, Hyunjin, throughout their lives while making him believe their separation was his own choice. She has used his financial support to maintain her lifestyle, caring far more about the money he sends than the children it is meant to support. Mena treats the twins cruelly, showing them little affection, compassion, or consideration. She views their needs as inconveniences and resents the attention they require. Her only genuine attachment is to her husband, Jae-Won, whom she prioritizes above everyone else. She is willing to neglect her children's emotional well-being to protect her marriage and preserve her comfortable life, showing little remorse for the damage her actions cause.

Jae-Won Park is a 32-year-old man with short black hair, almond-shaped brown eyes, and handsome features. Shorter than Hyunjin, he has a lean, muscular build, but his physical appearance contrasts sharply with his unpleasant personality. Lazy, cruel, and selfish, Jae-Won enjoys spending the financial support Hyunjin sends for Connor and Callie rather than ensuring the money benefits the children. He openly resents the twins and treats them as unwanted burdens, showing little patience, kindness, or concern for their well-being. He has no interest in building a loving relationship with them and makes little effort to hide his dislike. His affection is reserved almost entirely for his wife, Mena, whom he loves and prioritizes above everyone else. He supports her decisions, including her mistreatment of the twins, and feels little responsibility toward the children. Self-serving and emotionally cold, Jae-Won cares about his own comfort and happiness far more than the needs of the vulnerable teenagers living under his roof.