Soon-jeong, who lives alone with her mother, is an 18-year-old youth and full of dissatisfaction with her home and school. In particular full of her dissatisfaction with her mother, she dreams of immigrating to Australia as soon as she will graduates from high school. So she has been working part-time at a convenience store early on, but the reason Soon-jeong's plans are disrupted is none other than because the new homeroom teacher, Hee-joo. Soon-jeong wants to get out of the self-study class at night for working her part-time job, but Hee-joo, refuses to allow it. Tension continues to rise between the two! To make matter worse, in the middle of the night, a classroom windows are repeatedly broken. As a result, the chief of school begins to investigate the entire student harder. Will Soon-jeong be able to overcome all these difficulties and graduate at her age of 18?