The article tells the complex and painful story of a girl's relationship with her brother, who has XYY syndrome. It begins with their mother's pregnancy, during which the family discovers that the unborn brother has XYY chromosomes, leading to discussions about terminating the pregnancy. The mother insists on keeping the baby, hoping to raise him well, but the brother's violent tendencies gradually emerge, bringing turmoil and tragedy to the family. As time passes, the brother increasingly exhibits a lack of empathy and antisocial behavior, harming those around him, including family members and classmates. Despite the mother's continuous efforts to care for and guide him positively, the outcome leaves her exhausted, ultimately paying a heavy price. After the mother's death, the girl is forced to confront her brother and begins to fight back to protect herself. Through a series of conflicts and confrontations, she realizes that her brother is an irredeemable bad seed and ultimately takes extreme measures to try to break free from his control. The article reveals the intricate relationships between family, love, pain, and mental health, as well as the struggles and choices individuals make in dire situations.