Hae-young (Kim Hye-yoon) is a desperate girl. She has tattoos all over her arms. She uses vulgar language, even violent ones. She is a terrible troublemaker. She has no mother and lives with her father (Park Hyuk-kwon), who runs a Chinese restaurant, and her younger brother. One day, her father has a mysterious accident, which puts her in a difficult position. Not only is she now the head of the family who must take care of her younger brother, she is also an investigator tasked with finding the truth of the accident, and a fighter against the ugly world. A detective (Yesung) tries to help her, but her life is far from smooth or well-organized. Her lifestyle has not changed. However, as the story progresses, her boldness brings out honesty and innocence, which ultimately fills the film with touching moments. How will she operate the bulldozer?