Hae Young is a hopeless girl. She has tattoos all over her arms. She uses vulgar language, and is even violent. She is a terrible troublemaker. She does not have a mother and lives with her father, who runs a Chinese restaurant, and a younger sibling. One day, her father has a mysterious accident, which places her in a position of responsibility. She is now not only the head of the house and must look after her younger sibling, but also an investigator tasked with finding the truth about the accident, and a fighter standing against the ugly world. A detective tries to help her, but her life is far from being easy or organized.